BETA — measurements and names under active refinement. Seen a sign, a gate, or a better name? Submit an update no account needed · photos welcome via GitHub
UK Hill Climb Survey — road gradients measured by LiDAR
How steep is that hill, really? It depends how far you measure: the same hill can honestly be 32% over 2 m and 25% over 100 m at once. So every number here states the distance it was measured over, computed from public laser height surveys in a way anyone can re-check. It began with one contradictory road sign in Wales and now spans all four UK nations — every climb the open laser record can support, measured the same way everywhere. The survey is a work in progress, updated as and when new data lands and review time allows — and the method travels: anywhere that publishes open LiDAR can be next. This is an open survey, not a vetted route guide: every number can be re-checked from the open data, corrections are welcome from anyone — and access, surfaces and safety are yours to judge on the ground. How to read these numbers →
Measured, not collectedEvery gradient is computed from national LiDAR surveys by one published method — never copied from a sign, a book or a GPS track.
Every maximum states its distanceCefn Llan carried a 25% sign and a 32% sign — both arguably right, at different measuring distances (25.1% over 100 m, 32.1% over 2 m). A bare percentage can't be checked.
Shows its workingConfidence, quality flags, provenance to the exact survey tiles, and a machine-readable file on every climb page. Verify any number from the same open data.
Claims are tested, not trustedSigns, book values and local reports are recorded as evidence and compared with the measurement — why this survey exists →
See all the measured roads on one map →
1500 climbs published · 178 km of total ascent between them · steepest 25 m: 32.6% (Ffordd Pen Llech) · longest: 9.4 km (Lawnt to Tir Mostyn) · 64 counties · share the survey
Which hills get a page here
We measure every public road in a region that shows any hint of being steep — more than twenty thousand roads across the UK so far. Most turn out to be ordinary; they stay in the dataset. The few hundred most remarkable per nation get a page of their own. A hill earns one in any of three ways:
- It is seriously steep. Somewhere on the hill there is a stretch of at least 25 continuous metres steeper than that nation’s cutoff — currently 20% in every nation, where the laser has a clear view of the road at that spot. Where trees or bridges make the measurement less certain, the bar is higher (26%) and a person checks each one before it is published.
- It is a big climb. A long, unrelenting ascent (on the order of 1.5–2 km at around 10% or steeper), or one of the 30 biggest total ascents in its nation.
- People already know it. National Hill Climb Championship venues, the climbs of Simon Warren’s original 100 Greatest Cycling Climbs, and a small hand-picked founding set. Mentions on other lists are noted on pages but don’t create a page by themselves.
The cutoffs are editorial, not physics: they are set to keep each nation’s pages a manageable, human-reviewable number, focused on the hills most likely to be the steepest, longest or hardest — and they loosen as review capacity grows. A hill below the cutoff is still measured, still in the dataset, and still checkable — absence of a page is never a verdict on the hill.
What the open data supports. These tables publish exactly what the public laser record can prove — no estimates, no filler. Where a nation’s open coverage runs deep (Wales, England), so do the tables. Where it is still growing, we publish every climb the data already supports: Scotland’s open coverage is a patchwork today (its national LiDAR programme is capturing the whole country through 2027), and Northern Ireland’s published LiDAR reaches roughly a quarter of its roads — enough to measure Belfast’s steepest streets, not yet the Antrim coast’s famous climbs. A famous hill missing from these tables is almost always waiting for data, not judgement — the measured case for more open elevation data. The tables reflect sources and reviews as of August 2026; nations are not all on the same vintage — this is a working survey, updated as and when. The same approach works anywhere with open laser data — other countries are on the roadmap.
The data behind the tables
The tables below are three cuts of one dataset — steepest by measuring window, largest rise, and the full page catalogue. The measurements themselves are the product: every climb page ships a machine-readable OCL document, the catalogue is a downloadable CSV (ODbL — reuse terms), and the complete measured database — every road we measured, paged or not — is queued for publication as open data.
Steepest 10 m
| # | Climb | Max | Length | Overall | Confidence |
|---|---|---|---|---|---|
| 1 | Rhiw Syr Dafydd | ≈40% | 125 m | 20.6% | Good |
| 2 | Hookway Hill | ≈40% | 1765 m | 7.9% | Good |
| 3 | Sennybridge to Yr Allt° | 40% | 1412 m | 3.9% | Good |
| 4 | Mountain Road | ≈40% | 514 m | 10.4% | Good |
| 5 | Cotley Lane | 40% | 2920 m | 4.4% | Good |
| 6 | Rorrington to Hemford° | 39% | 3946 m | 4.8% | Good |
| 7 | Lane near Penpoll° | ≈39% | 1580 m | 4.9% | Good |
| 8 | Woolacombe Station Road | ≈39% | 2501 m | 5.8% | Good |
| 9 | Lane near Pillaton° | ≈39% | 1639 m | 5.9% | Good |
| 10 | Lane near Great Weeke° | ≈39% | 2056 m | 5.5% | Good |
| 11 | Nomansland to Uppincott° | ≈39% | 1434 m | 4.1% | Good |
| 12 | Ffordd-las to Hay Bluff | ≈39% | 6920 m | 4.3% | Good |
| 13 | Bignor Down | 39% | 1874 m | 8.7% | Good |
| 14 | School Road | ≈38% | 826 m | 10.0% | Good |
| 15 | Goodshelter to Rickham° | ≈38% | 1551 m | 8.5% | Good |
≈ measured under tree canopy or near a structure at this window — the value stands but is less certain — the flag does not say whether the true value is higher or lower. Each climb page details what was flagged and why.
° provisional auto-generated name — details on the climb page.
Steepest 25 m
| # | Climb | Max | Length | Overall | Confidence |
|---|---|---|---|---|---|
| 1 | Ffordd Pen Llech | ≈32.6% | 237 m | 17.2% | Good |
| 2 | Chalford Bottom to Burnt Ash° | ≈32.5% | 1614 m | 7.6% | Good |
| 3 | Pannier Lane | 32.0% | 601 m | 8.7% | High |
| 4 | Valley Road | 32.0% | 401 m | 13.4% | High |
| 5 | Ffordd-las to Hay Bluff | ≈31.9% | 6920 m | 4.3% | Good |
| 6 | Allt y Badi (south side) | ≈31.7% | 2707 m | 9.0% | Good |
| 7 | Mountain Road | ≈31.4% | 514 m | 10.4% | Good |
| 8 | Whiterock Road | ≈31.3% | 866 m | 11.9% | Good |
| 9 | Snakelake Hill | ≈31.2% | 1408 m | 4.4% | Good |
| 10 | Route Des Alpes | ≈31.0% | 2169 m | 6.8% | Good |
| 11 | Harper's Lane | ≈30.7% | 642 m | 13.2% | Good |
| 12 | Hey Lane | 30.6% | 2478 m | 7.9% | Good |
| 13 | Llanellen to Coed y Prior | ≈30.4% | 950 m | 14.5% | Good |
| 14 | Nomansland to Uppincott° | ≈30.3% | 1434 m | 4.1% | Good |
| 15 | Rorrington to Hemford° | 30.2% | 3946 m | 4.8% | Good |
≈ measured under tree canopy or near a structure at this window — the value stands but is less certain — the flag does not say whether the true value is higher or lower. Each climb page details what was flagged and why.
° provisional auto-generated name — details on the climb page.
Steepest 50 m
| # | Climb | Max | Length | Overall | Confidence |
|---|---|---|---|---|---|
| 1 | Ffordd Pen Llech | ≈29.8% | 237 m | 17.2% | Good |
| 2 | Chalford Bottom to Burnt Ash° | ≈28.6% | 1614 m | 7.6% | Good |
| 3 | Mountain Road | ≈28.5% | 514 m | 10.4% | Good |
| 4 | Llanguicke Road | ≈28.4% | 1172 m | 13.3% | Good |
| 5 | Ffordd Bryn Fran | ≈27.9% | 2943 m | 9.9% | Good |
| 6 | Dinas Oleu Lane | ≈27.8% | 198 m | 21.5% | Good |
| 7 | Llanellen to Coed y Prior | ≈27.5% | 950 m | 14.5% | Good |
| 8 | Ffordd Llwyn Du | 27.4% | 1494 m | 12.2% | Good |
| 9 | Bussage Hill | ≈27.3% | 1170 m | 9.0% | Good |
| 10 | Lane near Fron° | ≈27.0% | 492 m | 18.1% | Good |
| 11 | Whiterock Road | ≈27.0% | 866 m | 11.9% | Good |
| 12 | Park Mill Lane | ≈26.8% | 827 m | 8.5% | Good |
| 13 | Whitty Lane | 26.7% | 1275 m | 9.1% | High |
| 14 | Pannier Lane | 26.6% | 601 m | 8.7% | High |
| 15 | Valley Road | 26.6% | 401 m | 13.4% | High |
≈ measured under tree canopy or near a structure at this window — the value stands but is less certain — the flag does not say whether the true value is higher or lower. Each climb page details what was flagged and why.
° provisional auto-generated name — details on the climb page.
Steepest 100 m
| # | Climb | Max | Length | Overall | Confidence |
|---|---|---|---|---|---|
| 1 | Ffordd Pen Llech | ≈26.5% | 237 m | 17.2% | Good |
| 2 | Bussage Hill | ≈26.3% | 1170 m | 9.0% | Good |
| 3 | Whitty Lane | 26.1% | 1275 m | 9.1% | High |
| 4 | Dinas Oleu Lane | ≈25.3% | 198 m | 21.5% | Good |
| 5 | Park Mill Lane | ≈25.2% | 827 m | 8.5% | Good |
| 6 | Cefn Llan | ≈25.1% | 218 m | 19.4% | Good |
| 7 | Clifton Hill | 24.9% | 141 m | 23.9% | High |
| 8 | Littlebeck to Eskdaleside° | ≈24.7% | 2137 m | 5.2% | Good |
| 9 | Bredwardine Hill | 24.7% | 3307 m | 7.0% | High |
| 10 | Dabdike Stones to Runswick Bay° | 24.4% | 398 m | 17.7% | High |
| 11 | Mount Road | ≈24.4% | 825 m | 11.5% | Good |
| 12 | Ffordd Bryn Fran | ≈24.4% | 2943 m | 9.9% | Good |
| 13 | Llanellen to Coed y Prior | ≈24.2% | 950 m | 14.5% | Good |
| 14 | Whiterock Road | ≈24.2% | 866 m | 11.9% | Good |
| 15 | Vine Row | ≈24.1% | 667 m | 12.3% | Good |
≈ measured under tree canopy or near a structure at this window — the value stands but is less certain — the flag does not say whether the true value is higher or lower. Each climb page details what was flagged and why.
° provisional auto-generated name — details on the climb page.
Largest net rise
| # | Climb | Net rise | Total ascent | Length | Overall | Confidence |
|---|---|---|---|---|---|---|
| 1 | Llanellen to Cefn y Galchen° | 452 m | 482 m | 5964 m | 7.6% | Good |
| 2 | Hay on Wye to Mynydd Brith° | 332 m | 351 m | 6042 m | 5.5% | High |
| 3 | Lawnt to Tir Mostyn° | 331 m | 430 m | 9367 m | 3.5% | High |
| 4 | Dardy to Blaen Onneu° | 328 m | 361 m | 6272 m | 5.2% | Good |
| 5 | Milltir Gerrig | 325 m | 337 m | 5940 m | 5.5% | Good |
| 6 | Snake Road | 325 m | 325 m | 5105 m | 6.4% | High |
| 7 | Cyffredyn to Blaen Onneu° | 323 m | 339 m | 4794 m | 6.7% | Good |
| 8 | Holmfirth Road | 318 m | 322 m | 5501 m | 5.8% | High |
| 9 | Tacker Street to Brendon Hills° | 316 m | 366 m | 4767 m | 6.6% | Good |
| 10 | Hardknott Pass | 315 m | 318 m | 3119 m | 10.1% | Good |
| 11 | Nateby to Fells End Bottom° | 309 m | 322 m | 4269 m | 7.2% | High |
| 12 | Erwyd to Llangynog | 308 m | 345 m | 5937 m | 5.2% | Good |
| 13 | Rhigos Road | 305 m | 308 m | 6004 m | 5.1% | High |
| 14 | Welsh Harp Hollow | 304 m | 315 m | 3695 m | 8.2% | Good |
| 15 | Beara Hill | 303 m | 306 m | 4465 m | 6.8% | High |
° provisional auto-generated name — details on the climb page.
Net rise is the endpoint elevation difference (what overall gradient is computed from); total ascent counts every metre climbed, including dips regained. Rankings include high- and good-confidence measurements only (how confidence works). Rankings order the computed estimates; differences smaller than the measurement uncertainty (about ±1.4 pp at 10 m, smaller at longer windows) should not be read as significant — neighbouring entries may genuinely be tied.
Provisional discoveries — awaiting review
These trip our own plausibility checks (confidence: needs confirmation): the numbers below may be terrain-model artifacts and are NOT ranked until a human review — or your local knowledge — settles them. Steepest first at 10 m.
| # | Climb | Max 10 m | Length | Confidence |
|---|---|---|---|---|
| 1 | Lane near Carnach° | 43% | 529 m | Needs confirmation |
| 2 | Newcastle to Spoad Hill° | 42% | 1765 m | Needs confirmation |
| 3 | Berwyn to Geraint Hill° | 42% | 3790 m | Needs confirmation |
| 4 | Pengarrock Hill | 42% | 1166 m | Needs confirmation |
| 5 | Bodmiscombe to Sheldon Hill° | 42% | 1834 m | Needs confirmation |
| 6 | Sunny Bank Lane | 42% | 588 m | Needs confirmation |
| 7 | Winksley to Woodhouse Hill° | 41% | 1344 m | Needs confirmation |
| 8 | Weary Bank | 41% | 1446 m | Needs confirmation |
| 9 | Buckland Monachorum to Tuckermarsh° | 40% | 2370 m | Needs confirmation |
| 10 | Lane near St Jidgey° | 40% | 2552 m | Needs confirmation |
° provisional auto-generated name — details on the climb page.
…and 321 more in the catalogue below (filter: awaiting review).
All climbs (1500)
| Climb | Area | Matches | Shape | Length | Net rise | Overall | Max 25 m | Confidence |
|---|---|---|---|---|---|---|---|---|
| Abbey Lane | near Freshford · Somerset | — | stepped | 772 m | 77 m | 9.9% | 21.6% | Good |
| Abbot's Hill to Beaford° | near Beaford · Devon | — | sustained | 1411 m | 114 m | 8.1% | 23.5% | Needs confirmation |
| Aber Eiddy to Berea° | near Aber Eiddy · Dyfed | — | sustained | 1391 m | 81 m | 5.9% | ≈20.2% | Good |
| Aberarth to Graig Ddu | near Aberarth · Dyfed | — | sustained | 1967 m | 98 m | 5.0% | 12.9% | High |
| Aberdyfi to Ffridd Cefn-isaf° | near Aberdyfi · Gwynedd | — | sustained | 1610 m | 181 m | 11.2% | 20.9% | High |
| Aberedw to Pontsioni° | near Aberedw · Powys | — | sustained | 654 m | 93 m | 14.3% | 26.5% | Good |
| Aberffrwd Hill | near Aberffrwd · Dyfed | — | sustained | 2372 m | 237 m | 10.0% | ≈26.1% | Good |
| Aberyscir to Cwm Ynysgyfarch° | near Aberyscir · Powys | — | sustained | 4417 m | 167 m | 3.8% | 21.9% | Needs confirmation |
| Accrington Bypass | near Huncoat · Lancashire | — | sustained | 597 m | 33 m | 5.6% | ≈29.4% | Good |
| Ackerlls Hill to Berry Pomeroy° | near Littlehempston · Devon | — | sustained | 853 m | 75 m | 8.8% | 21.3% | Needs confirmation |
| Ackrell's Hill | near Littlehempston · Devon | — | sustained | 1657 m | 77 m | 4.7% | 21.0% | Needs confirmation |
| Acland Road | near Landkey · Devon | — | sustained | 928 m | 89 m | 9.6% | 27.3% | Needs confirmation |
| Adams Street to Cerrig yr Hafan | near Tal-y-bont · Dyfed | — | sustained | 8383 m | 380 m | 4.5% | 14.5% | Needs confirmation |
| Adey's Lane | near Wotton-under-Edge · Gloucestershire | — | sustained | 901 m | 109 m | 12.0% | 22.1% | High |
| Aggs Hill | near Battledown · Gloucestershire | — | sustained | 2367 m | 189 m | 8.0% | 20.0% | Good |
| Aish to Brent Hill° | near Aish · Devon | — | sustained | 2721 m | 158 m | 5.8% | 22.3% | Good |
| Aisthorpe Road | near Fourlane Ends | — | stepped | 279 m | 25 m | 9.1% | 20.1% | High |
| All Stretton to Long Batch° | near All Stretton · Shropshire | — | sustained | 6431 m | 303 m | 4.7% | 22.2% | High |
| Aller Hill | near Newtown · Devon | — | stepped | 1179 m | 72 m | 6.1% | ≈26.7% | Good |
| Allt Bron Philip | near Llanddona · Gwynedd | — | sustained | 1442 m | 139 m | 9.6% | ≈26.2% | Good |
| Allt Goch Fawr | near Beaumaris · Gwynedd | tag: 25% (2026) | stepped | 1266 m | 83 m | 6.5% | ≈15.0% | Needs confirmation |
| Allt y Badi (south side) | near Glyn Ceiriog · Clwyd | tag: 25% (2026) | stepped | 2707 m | 243 m | 9.0% | ≈31.7% | Good |
| Ankers Knowl Lane | near King's Clough · Cheshire | — | sustained | 983 m | 86 m | 8.7% | 21.0% | High |
| Appleby Road | near Kendal · Cumbria | — | stepped | 1854 m | 73 m | 4.0% | 21.4% | Good |
| Applethwaite to Latrigg° | near Applethwaite · Cumbria | — | sustained | 1828 m | 183 m | 10.0% | 18.0% | Good |
| Arbour Lane | near Linley · Shropshire | — | stepped | 2542 m | 107 m | 4.2% | 20.1% | High |
| Arthur's Stone Lane | near Bredwardine · Herefordshire | — | sustained | 2452 m | 203 m | 8.3% | 20.6% | Good |
| Ashburton to Combe° | near Ashburton · Devon | — | sustained | 3225 m | 259 m | 8.0% | 18.2% | Needs confirmation |
| Ashburton to Yolland Hill° | near Ashburton · Devon | — | sustained | 267 m | 41 m | 15.5% | 20.5% | High |
| Ashfield Barn Road | near Turville · Buckinghamshire | — | stepped | 1263 m | 98 m | 7.8% | ≈26.7% | Needs confirmation |
| Ashton Hill | near Corston · Somerset | — | stinger | 2245 m | 70 m | 3.1% | 20.4% | Good |
| Askerbank Lane | near Rushton Bank · Staffordshire | — | sustained | 1200 m | 52 m | 4.3% | ≈21.2% | Good |
| Aston Hill to Forest Dingle° | near Mondaytown · Shropshire | — | stepped | 3313 m | 168 m | 5.1% | 23.1% | Needs confirmation |
| Auchengreoch Road | near Spateston · Renfrewshire | — | sustained | 2885 m | 160 m | 5.5% | ≈13.5% | Needs confirmation |
| Back Lane | near Swainby · North Yorkshire | — | stepped | 2541 m | 146 m | 5.7% | 21.2% | Good |
| Back of Ecton | near Ecton · Staffordshire | — | sustained | 1898 m | 105 m | 5.6% | 21.9% | High |
| Back oth Cross | near Robins Clough · Cheshire | — | sustained | 2298 m | 190 m | 8.2% | 21.4% | Good |
| Badgall to Three Hammers° | near Tresmeer · Cornwall | — | stepped | 852 m | 56 m | 6.5% | 21.3% | Good |
| Bag Tor to Haytor Vale° | near Haytor Vale · Devon | — | sustained | 756 m | 50 m | 6.6% | 20.9% | High |
| Baldock Bypass | near Clothall Common · Hertfordshire | — | stinger | 1723 m | 63 m | 3.7% | ≈21.1% | Good |
| Ball Hill | near Upham · Devon | — | stepped | 694 m | 42 m | 6.1% | 23.1% | High |
| Ball Hill to Colwell° | near Northleigh · Devon | — | stepped | 2625 m | 118 m | 4.5% | 27.9% | High |
| Ballygomartin Road | near Belfast · County Antrim | — | sustained | 1065 m | 103 m | 9.6% | 23.4% | Good |
| Bampton Grange to Aika Hill° | near Bampton Grange · Cumbria | — | sustained | 2216 m | 148 m | 6.7% | 20.2% | High |
| Bank Clough to Oldgate Nick° | near Bank Clough · Cheshire | — | sustained | 1773 m | 186 m | 10.5% | ≈26.8% | Needs confirmation |
| Bank Fold Lane | near Belthorn · Lancashire | — | sustained | 673 m | 81 m | 12.1% | ≈20.8% | Good |
| Bank Hey Bottom Lane | near Ripponden | — | stepped | 1030 m | 66 m | 6.4% | 20.8% | Good |
| Bank Road | near Matlock · Derbyshire | 100 Climbs1, National HC2, Wikipedia3 | sustained | 530 m | 57 m | 10.7% | 15.5% | High |
| Banks to Low Row° | near Banks · Cumbria | — | stepped | 2843 m | 91 m | 3.2% | 22.2% | Needs confirmation |
| Barber's Hill | near Llangollen · Clwyd | National HC2 | sustained | 6052 m | 276 m | 4.6% | ≈21.7% | Good |
| Barton Steep | near Cheriton · Devon | — | sustained | 471 m | 75 m | 15.9% | ≈23.6% | Good |
| Batt's Hill to Cole's Cross° | near Goveton · Devon | — | sustained | 1429 m | 110 m | 7.7% | 22.3% | High |
| Baybridge to Townfield° | near Blanchland · Northumberland | — | stepped | 4046 m | 131 m | 3.2% | 21.8% | Needs confirmation |
| Beach Hay to Pound Bank° | near Lem Hill · Worcestershire | — | sustained | 1844 m | 75 m | 4.1% | 21.6% | Good |
| Beach Road | near Babbacombe · Devon | — | sustained | 420 m | 78 m | 18.5% | ≈29.3% | Good |
| Beara Hill | near Lydcott · Devon | — | sustained | 4465 m | 303 m | 6.8% | 15.9% | High |
| Beck Side to Friars' Ground° | near Kirkby-in-Furness · Cumbria | — | sustained | 996 m | 98 m | 9.9% | ≈22.5% | Needs confirmation |
| Beck Side to Knottallow Hill° | near Kirkby-in-Furness · Cumbria | — | sustained | 1987 m | 221 m | 11.1% | 21.8% | Needs confirmation |
| Bedwellty Road | near Bargod · Gwent | — | sustained | 1891 m | 144 m | 7.6% | 21.0% | High |
| Beech Lane | near Guildford · Surrey | — | stepped | 401 m | 32 m | 8.0% | 20.2% | Good |
| Beechdale Lane | near Beech Dale · Staffordshire | — | sustained | 629 m | 60 m | 9.5% | ≈23.1% | Good |
| Beek's Lane | near Nimlet · Gloucestershire | — | stepped | 2086 m | 118 m | 5.7% | 20.7% | Good |
| Ben Madigan Park | near Belfast · County Antrim | — | sustained | 278 m | 35 m | 12.5% | 21.0% | High |
| Bendle Lane | near North Molton · Devon | — | sustained | 1217 m | 78 m | 6.4% | 20.1% | Needs confirmation |
| Bennett's Lane | near Bath · Somerset | — | sustained | 378 m | 54 m | 14.2% | 23.5% | High |
| Bere Ferrers to Bere Alston° | near Bere Ferrers · Devon | — | stepped | 2257 m | 123 m | 5.4% | 21.7% | Good |
| Berry's Ground Lane | near Martinhoe Common · Devon | — | stepped | 1650 m | 102 m | 6.2% | 24.6% | Needs confirmation |
| Berwyn to Geraint Hill° | near Llangollen · Clwyd | — | sustained | 3790 m | 286 m | 7.5% | ≈20.9% | Needs confirmation |
| Besbury Lane | near Minchinhampton · Gloucestershire | — | stepped | 1024 m | 44 m | 4.3% | 26.7% | Good |
| Bethlehem to Carn Powell° | near Bethlehem · Dyfed | — | sustained | 3549 m | 201 m | 5.7% | ≈29.6% | Good |
| Betton Dingle to Gravelsbank° | near Betton Dingle · Shropshire | — | sustained | 3243 m | 247 m | 7.6% | 23.7% | High |
| Bevan Avenue | near Mochdre · Clwyd | — | stepped | 660 m | 61 m | 9.2% | 23.0% | High |
| Beverley Gardens | near Ashburton · Devon | — | stepped | 412 m | 31 m | 7.6% | 22.9% | Needs confirmation |
| Bias Cliff to Rockhole Hill° | near Bias Cliff · North Yorkshire | — | stepped | 1501 m | 121 m | 8.1% | 20.7% | Good |
| Bickham to Diptford° | near Bickham · Devon | — | sustained | 1786 m | 65 m | 3.7% | ≈21.9% | Needs confirmation |
| Bickham to North Huish° | near Bickham · Devon | — | sustained | 2223 m | 78 m | 3.5% | 27.3% | Needs confirmation |
| Bickleigh Vale to Bickleigh° | near Bickleigh · Devon | — | sustained | 603 m | 76 m | 12.6% | ≈23.4% | Needs confirmation |
| Bickwell Lane | near Sidmouth · Devon | — | stepped | 343 m | 34 m | 10.0% | 25.8% | Needs confirmation |
| Bignor Down | near Sutton · West Sussex | — | stepped | 1874 m | 162 m | 8.7% | ≈28.2% | Good |
| Binneford Hill | near Kennerleigh · Devon | — | sustained | 651 m | 65 m | 10.0% | 21.0% | Needs confirmation |
| Binweston Lane | near Binweston · Shropshire | — | sustained | 4862 m | 273 m | 5.6% | ≈22.4% | Good |
| Birdy Brow | near Bashall Town · Lancashire | — | sustained | 1721 m | 176 m | 10.3% | ≈16.5% | Good |
| Birk Field Bank | near Westerdale · North Yorkshire | — | sustained | 643 m | 71 m | 11.0% | 21.5% | High |
| Bitthams Lane | near Chilsworthy · Cornwall | — | sustained | 1070 m | 125 m | 11.7% | 27.8% | Needs confirmation |
| Black Head to Shepherd's Hill° | near Black Head · Dumfries and Galloway | — | sustained | 1896 m | 102 m | 5.4% | 21.9% | Good |
| Black Rhadley Hill to The Bog° | near Coppice Dingle · Shropshire | — | sustained | 3900 m | 178 m | 4.6% | 20.6% | Good |
| Blackquarries Hill | near Wotton-under-Edge · Gloucestershire | — | stepped | 1608 m | 134 m | 8.4% | 23.1% | High |
| Blacksmill Hill to Clockmill° | near Hell's Cleugh · Scottish Borders | — | sustained | 3508 m | 190 m | 5.4% | ≈12.3% | Good |
| Blackvein Mountain Road | near Risca · Gwent | — | sustained | 1688 m | 176 m | 10.4% | ≈25.9% | Good |
| Blackwood Hill Road | near Longsdon · Staffordshire | — | sustained | 3310 m | 151 m | 4.6% | 20.5% | Needs confirmation |
| Blaenavon Road | near Govilon · Gwent | — | sustained | 4320 m | 367 m | 8.5% | ≈14.5% | Needs confirmation |
| Blaendare Farm Lane | near Pontypool · Gwent | — | sustained | 510 m | 55 m | 10.8% | 22.5% | Good |
| Blakeney to Blakeney Hill° | near Blakeney · Gloucestershire | — | sustained | 1513 m | 121 m | 8.0% | 22.5% | Good |
| Blakey Lane | near Castleton · North Yorkshire | — | sustained | 6749 m | 282 m | 4.2% | 18.2% | High |
| Boarsgreave Lane | near Cowpe · Lancashire | — | sustained | 252 m | 32 m | 12.9% | 20.6% | Needs confirmation |
| Boasley Road | near Bratton Clovelly · Devon | — | sustained | 466 m | 50 m | 10.8% | 24.7% | Good |
| Bod Ivan | near Y Drenewydd · Powys | — | stepped | 595 m | 34 m | 5.6% | 23.4% | Good |
| Bodinnick to Blackbottle Rock° | near Fowey · Cornwall | — | sustained | 936 m | 78 m | 8.4% | ≈22.7% | Good |
| Bodmiscombe to Collard Hill° | near Bodmiscombe · Devon | — | stepped | 2314 m | 116 m | 5.0% | 20.3% | High |
| Bodmiscombe to Sheldon Hill° | near Bodmiscombe · Devon | — | sustained | 1834 m | 121 m | 6.6% | ≈27.2% | Needs confirmation |
| Boltby to Silver Hill° | near Boltby · North Yorkshire | — | sustained | 1402 m | 156 m | 11.2% | 24.7% | High |
| Boode Road | near Braunton · Devon | — | stepped | 2399 m | 95 m | 4.0% | 20.8% | High |
| Booth House Lane | near Holmfirth | — | sustained | 2163 m | 151 m | 7.0% | 23.4% | High |
| Boscastle to Condolden Barrow° | near Boscastle · Cornwall | — | stepped | 4084 m | 208 m | 5.1% | 21.9% | Needs confirmation |
| Bospin Lane | near Woodchester · Gloucestershire | — | sustained | 346 m | 58 m | 16.8% | 23.7% | Needs confirmation |
| Boughrood to Trewern Hill° | near Bochrwyd · Powys | — | sustained | 4401 m | 228 m | 5.2% | 21.9% | High |
| Boulby Bank | near Redhouse Nab · North Yorkshire | — | stepped | 1622 m | 130 m | 8.0% | 20.7% | High |
| Bowden Lane | near Red Girts · Somerset | — | stepped | 509 m | 44 m | 8.7% | ≈21.0% | Good |
| Bowjey Hill | near Newlyn · Cornwall | — | sustained | 501 m | 67 m | 13.4% | 28.9% | Needs confirmation |
| Bownham to Bagpath° | near Bownham · Gloucestershire | — | stepped | 1294 m | 81 m | 6.2% | 22.4% | Good |
| Box Hill to Rudloe° | near Box Hill · Wiltshire | — | stepped | 1801 m | 111 m | 6.2% | 20.2% | High |
| Brace Avenue | near Abertyleri · Gwent | — | sustained | 937 m | 60 m | 6.4% | 21.1% | High |
| Brae to Oape° | near Brae · Highland | — | sustained | 1477 m | 35 m | 2.4% | 21.4% | High |
| Braes Road | near Ullapool · Highland | — | sustained | 1201 m | 96 m | 8.0% | 20.3% | Good |
| Bransdale Road | near Cockayne · North Yorkshire | — | sustained | 430 m | 46 m | 10.8% | 22.1% | Needs confirmation |
| Brayford to Berry Hill° | near Brayford · Devon | — | sustained | 4187 m | 161 m | 3.9% | ≈29.0% | Good |
| Breakneck Hill | near East Stowford · Devon | — | sustained | 816 m | 64 m | 7.9% | ≈22.3% | Needs confirmation |
| Bredwardine Hill | near Bredwardine · Herefordshire | — | stepped | 3307 m | 231 m | 7.0% | 29.5% | High |
| Brendon to Kipscombe Hill° | near Brendon · Devon | — | sustained | 796 m | 98 m | 12.3% | 21.0% | High |
| Brick End to Hill of Eaton° | near Brick End · Herefordshire | — | stepped | 991 m | 45 m | 4.6% | 21.4% | High |
| Brigham to Castlerigg° | near Keswick · Cumbria | — | sustained | 1452 m | 90 m | 6.2% | 22.1% | Needs confirmation |
| Brightholmlee Road | near Wharncliffe Side | — | sustained | 3345 m | 259 m | 7.7% | 16.7% | High |
| Brightonwater to Great Care Hill° | near Cardinham · Cornwall | — | stepped | 3165 m | 122 m | 3.9% | ≈29.1% | Needs confirmation |
| Brimley to Top Tor° | near Brimley · Devon | — | sustained | 7590 m | 297 m | 3.9% | 18.9% | Needs confirmation |
| Brimscombe to Swift's Hill° | near Brimscombe · Gloucestershire | — | stepped | 4161 m | 174 m | 4.2% | ≈23.3% | Good |
| Broad Lane | near Saunton · Devon | — | sustained | 1796 m | 116 m | 6.4% | 23.7% | Good |
| Broad Park Avenue | near Ilfracombe · Devon | — | stepped | 379 m | 29 m | 7.7% | 20.2% | High |
| Broadmead Lane | near Crockerton · Wiltshire | — | stepped | 340 m | 30 m | 8.9% | 20.4% | High |
| Brock Mill Lane | near Hell Clough · Lancashire | — | sustained | 310 m | 31 m | 9.9% | 25.1% | Good |
| Brockholes Lane | near Brockholes | — | sustained | 1506 m | 154 m | 10.3% | ≈19.7% | Good |
| Bronallt Road | near Pontarddulais · West Glamorgan | — | stepped | 663 m | 61 m | 9.3% | 22.1% | Good |
| Brongwyn to Capel Tygwydd° | near Brongwyn · Dyfed | — | stepped | 1288 m | 64 m | 5.0% | ≈26.0% | Good |
| Broom Hill to Glaisdale Rigg° | near Fairy Cross Plain · North Yorkshire | — | stepped | 4062 m | 162 m | 4.0% | 22.2% | Needs confirmation |
| Broomfield Hall Road | near Enmore · Somerset | — | stepped | 2470 m | 157 m | 6.4% | ≈24.9% | Needs confirmation |
| Broughton Mills to The Knott° | near Broughton Mills · Cumbria | — | sustained | 4193 m | 225 m | 5.4% | 22.5% | Good |
| Brow Lane | near Catherine Slack | — | sustained | 1330 m | 111 m | 8.4% | 22.3% | High |
| Brow Road | near Haworth | — | sustained | 708 m | 88 m | 12.4% | 20.3% | High |
| Brown's Lane | near The Bage · Herefordshire | — | sustained | 1243 m | 110 m | 8.9% | 20.4% | High |
| Bryn Dolwen to Tyddyn° | near Cwm y Glog · Powys | — | sustained | 1499 m | 85 m | 5.7% | 20.2% | High |
| Bryn Rhyd-yr-Arian to Mynydd Tryfan° | near Bryn Rhyd-yr-Arian · Clwyd | — | sustained | 2925 m | 148 m | 5.1% | ≈29.0% | Good |
| Bryn Road | near Pen-Rhiw-fawr · West Glamorgan | — | sustained | 395 m | 49 m | 12.4% | 21.8% | High |
| Bryncethin Road | near Garnant · West Glamorgan | — | sustained | 1635 m | 146 m | 8.9% | ≈28.2% | Good |
| Brynllys to Bwlch Oerddrws° | near Cwm yr Eglwys · Gwynedd | Wikipedia3 | stepped | 5159 m | 248 m | 4.8% | 16.5% | High |
| Buckfast to Yolland Hill° | near Buckfast · Devon | — | stepped | 2453 m | 113 m | 4.6% | 26.3% | Needs confirmation |
| Buckland Monachorum to Tuckermarsh° | near Buckland Monachorum · Devon | — | sustained | 2370 m | 138 m | 5.8% | ≈22.0% | Needs confirmation |
| Buffery Road | near Dudley | — | sustained | 1053 m | 86 m | 8.2% | 22.7% | High |
| Burthwaite | near Bassenthwaite · Cumbria | — | stepped | 1597 m | 73 m | 4.6% | 24.4% | Good |
| Burythorpe to Lang Hill° | near Burythorpe · North Yorkshire | — | stepped | 965 m | 59 m | 6.2% | 20.3% | High |
| Bush Road | near Mountain Ash · Mid Glamorgan | — | sustained | 466 m | 60 m | 12.8% | 22.0% | High |
| Bussage Hill | near Brownshill · Gloucestershire | sign: 20% (2009) | stepped | 1170 m | 105 m | 9.0% | ≈29.0% | Good |
| Bustomley Lane | near Middleton Green · Staffordshire | — | sustained | 1752 m | 49 m | 2.8% | 20.1% | Good |
| Buttercombe Lane | near Braunton · Devon | — | sustained | 3951 m | 122 m | 3.1% | 20.8% | High |
| Butterhill Lane | near Smallrice · Staffordshire | — | stepped | 2017 m | 37 m | 1.8% | 20.2% | Good |
| Buzzacott Lane | near Combe Martin · Devon | — | stepped | 2804 m | 226 m | 8.1% | ≈26.1% | Good |
| Bwlch Esgair Gelli | — | sustained | 2497 m | 164 m | 6.6% | ≈22.6% | Good | |
| Bwlch Penbarras | near Llanbedr-Dyffryn-Clwyd · Clwyd | 100 Climbs1, National HC2, Wikipedia3 | sustained | 2324 m | 260 m | 11.2% | ≈24.4% | Needs confirmation |
| Bwlch Sychnant | near Capelulo · Clwyd | Wikipedia3, Warren app4 | sustained | 743 m | 93 m | 12.5% | ≈15.0% | Good |
| Bwlch y Groes | near Cwm Cerddin · Gwynedd | Wikipedia3, 100 Climbs1 | sustained | 1214 m | 188 m | 15.5% | 23.8% | High |
| Bwlch-y-Clawdd Road | near Treorchy · Mid Glamorgan | 100 Climbs1 | sustained | 4804 m | 270 m | 5.6% | 8.9% | High |
| Cadythew Rock to Boswinger° | near Cadythew Rock · Cornwall | — | sustained | 779 m | 81 m | 10.4% | ≈23.1% | Needs confirmation |
| Cairo Street | near Tonypandy · Mid Glamorgan | — | sustained | 358 m | 34 m | 9.5% | 22.3% | High |
| Calf Hey Lane | near Whitworth · Lancashire | — | stepped | 389 m | 41 m | 10.5% | 23.7% | High |
| Calton Road | near Thwaites | — | sustained | 1177 m | 127 m | 10.8% | 22.0% | High |
| Cam Gill Road | near Kettlewell · North Yorkshire | — | stepped | 1918 m | 60 m | 3.1% | 20.6% | High |
| Camp Lane | near Henley-in-Arden · Warwickshire | — | stepped | 1170 m | 55 m | 4.7% | 23.8% | High |
| Camptown to Carter Bar° | near Camptown · Scottish Borders | — | sustained | 8370 m | 290 m | 3.5% | ≈10.3% | Good |
| Canada Coombe | near Hutton · Somerset | — | sustained | 1050 m | 93 m | 8.9% | 21.4% | Good |
| Capel Bangor to Pant-y-crug | near Penllwyn · Dyfed | — | sustained | 1389 m | 145 m | 10.5% | ≈21.0% | Good |
| Capel Isaac to Mynydd Figyn° | near Capel Isaac · Dyfed | — | stepped | 3340 m | 147 m | 4.4% | 23.8% | Good |
| Cardinham to St Bellarmin's Tor° | near Cardinham · Cornwall | — | sustained | 1556 m | 153 m | 9.8% | 24.6% | Needs confirmation |
| Carey to Little Dewchurch° | near Carey · Herefordshire | — | stepped | 2692 m | 124 m | 4.6% | ≈21.8% | Good |
| Carlton Bank | near Carlton in Cleveland · North Yorkshire | — | sustained | 2136 m | 204 m | 9.5% | 21.1% | High |
| Carpley Green Road | near Bainbridge · North Yorkshire | — | sustained | 1825 m | 153 m | 8.4% | 23.5% | High |
| Carr Street | near Ramsbottom | — | sustained | 384 m | 47 m | 12.2% | 22.7% | High |
| Carsluith to Strife Hill° | near Carsluith · Dumfries and Galloway | — | stepped | 4937 m | 189 m | 3.8% | ≈13.2% | Good |
| Cartworth Bank Road | near Holmfirth | — | sustained | 1592 m | 119 m | 7.5% | 21.7% | Good |
| Caseberry Lane | near Hele · Devon | — | sustained | 1555 m | 164 m | 10.6% | ≈22.3% | Good |
| Casthorpe Road | near Barrowby · Lincolnshire | — | stepped | 1386 m | 50 m | 3.6% | 23.2% | Needs confirmation |
| Castle Hill to Brown Hill° | near Wooler · Northumberland | — | stepped | 896 m | 57 m | 6.4% | 21.2% | High |
| Castle Hill to Newton° | near Kington · Herefordshire | — | sustained | 249 m | 31 m | 12.3% | 24.5% | Needs confirmation |
| Castle Idris to Pen y Garn° | near Quabbs · Shropshire | — | sustained | 4438 m | 211 m | 4.8% | ≈21.0% | Good |
| Castle Idris to Pen y Garn° | near Quabbs · Shropshire | — | stepped | 4192 m | 203 m | 4.8% | 21.3% | Good |
| Castle Lane | near Sticklynch · Somerset | — | sustained | 751 m | 79 m | 10.6% | 23.8% | Needs confirmation |
| Castlepark Hill to Little Comfort° | near Rezare · Cornwall | — | stepped | 2162 m | 96 m | 4.5% | ≈20.9% | Good |
| Castlepark Hill to Little Comfort° | near Felldownhead · Devon | — | stepped | 1295 m | 92 m | 7.1% | ≈26.0% | Good |
| Castlepark Hill to Rezare° | near Rezare · Cornwall | — | stepped | 1317 m | 76 m | 5.8% | 21.1% | Good |
| Cat Lane | near Hele · Devon | — | sustained | 880 m | 86 m | 9.8% | 20.4% | Good |
| Cathole Lane | near Yawl · Devon | — | sustained | 1128 m | 102 m | 9.0% | 21.8% | Good |
| Cefn Llan | near Llanbadarn Fawr · Dyfed | sign: 32% (2025) | sustained | 218 m | 42 m | 19.4% | ≈27.4% | Good |
| Cefn Modfedd to Cwm yr Erw° | near Cwm yr Erw · Powys | — | sustained | 1609 m | 109 m | 6.8% | 24.0% | Good |
| Cefn Vron Hill to Bryn | — | sustained | 649 m | 50 m | 7.7% | ≈16.1% | Needs confirmation | |
| Ceunant Gorddinan to Ffridd-y-Bwlch | near Ceunant Gorddinan · Clwyd | — | sustained | 2266 m | 130 m | 5.7% | 11.6% | High |
| Chagford to Meldon Hill° | near Chagford · Devon | — | sustained | 1482 m | 147 m | 9.9% | 22.3% | Needs confirmation |
| Chalford Bottom to Burnt Ash° | near Chalford · Gloucestershire | — | sustained | 1614 m | 122 m | 7.6% | ≈32.5% | Good |
| Chalk Hill | near Harpsden · Kent | — | stepped | 1035 m | 44 m | 4.2% | ≈16.4% | Good |
| Chalk Pit Lane | near Litton Cheney · Dorset | — | stepped | 3047 m | 152 m | 5.0% | 20.3% | Good |
| Chalky Path | near Winterborne Stickland · Dorset | — | sustained | 512 m | 58 m | 11.3% | 20.8% | Good |
| Challacombe Hill | near Woolacombe · Devon | — | sustained | 1550 m | 163 m | 10.5% | 22.1% | High |
| Chapel Down Lane | near Brownston · Devon | — | stepped | 1847 m | 46 m | 2.5% | 20.4% | Good |
| Chard Lane | near Clapton · Somerset | — | stepped | 3004 m | 139 m | 4.6% | ≈20.5% | Good |
| Charlcombe Lane | near Larkhall · Somerset | — | sustained | 1962 m | 184 m | 9.4% | 20.2% | High |
| Charles Street | near Tonypandy · Mid Glamorgan | — | sustained | 915 m | 97 m | 10.6% | 20.7% | High |
| Chase End Hill to Whiteleaved Oak° | near Bromesberrow · Gloucestershire | — | sustained | 1298 m | 61 m | 4.7% | 20.5% | Needs confirmation |
| Chase End Road | near Eight Oaks · Worcestershire | — | sustained | 3422 m | 88 m | 2.6% | 25.9% | Good |
| Chelfham to Goodleigh° | near Chelfham · Devon | — | sustained | 1015 m | 133 m | 13.1% | ≈21.4% | Needs confirmation |
| Cheney Longville to Round Oak° | near Cheney Longville · Shropshire | — | sustained | 3148 m | 125 m | 4.0% | 21.5% | Good |
| Cheriton Fitzpaine to Poughill° | near Cheriton Fitzpaine · Devon | — | sustained | 1942 m | 87 m | 4.5% | 21.5% | Good |
| Chick Hill | near Cliff End · East Sussex | — | sustained | 340 m | 42 m | 12.5% | ≈29.6% | Good |
| Chipping to Lingey Hill° | near Chipping · Lancashire | — | sustained | 1351 m | 69 m | 5.1% | 20.8% | Needs confirmation |
| Chirbury to Middleton Hill° | near Chirbury · Shropshire | — | sustained | 3869 m | 188 m | 4.9% | 22.6% | Needs confirmation |
| Chitterley to Cadbury° | near Chitterley · Devon | — | sustained | 3150 m | 130 m | 4.1% | 20.8% | High |
| Chivelstone to South Pool° | near South Pool · Devon | — | sustained | 592 m | 65 m | 11.0% | ≈21.3% | Needs confirmation |
| Choppards Lane | near Hade Edge | — | sustained | 269 m | 40 m | 14.8% | 22.1% | High |
| Chuley Hill | near Ashburton · Devon | — | sustained | 704 m | 94 m | 13.4% | 20.3% | Good |
| Chur Lane | near West Coker · Somerset | — | stepped | 484 m | 55 m | 11.3% | 26.3% | Good |
| Church Avenue | near Lower Wellhouse | — | sustained | 222 m | 40 m | 17.9% | 25.5% | High |
| Churchbridge to Duloe° | near Churchbridge · Cornwall | — | sustained | 1563 m | 89 m | 5.7% | 20.6% | Needs confirmation |
| Churchbridge to Pendriscott° | near Churchbridge · Cornwall | — | stepped | 1486 m | 91 m | 6.1% | ≈21.2% | Good |
| Churchill Hill | near Clifton · Devon | — | stepped | 1045 m | 64 m | 6.1% | 24.6% | Good |
| Churchill to Churchill Down° | near Churchill · Devon | — | stepped | 1611 m | 61 m | 3.8% | 21.3% | High |
| Churchwater to Cottwood° | near Riddlecombe · Devon | — | stepped | 2094 m | 97 m | 4.6% | 21.3% | Good |
| Cinder Hills Road | near Holmfirth | — | sustained | 1322 m | 113 m | 8.5% | 23.6% | Needs confirmation |
| Clampit to Hatt° | near Botusfleming · Cornwall | — | sustained | 1326 m | 82 m | 6.2% | ≈20.4% | Good |
| Clanyard to Kirkmaiden° | near Clanyard · Dumfries and Galloway | — | stepped | 2679 m | 58 m | 2.2% | 20.4% | High |
| Clapworthy to Broden Hill° | near Clapworthy · Devon | — | sustained | 2126 m | 112 m | 5.3% | 24.7% | Good |
| Clearways Lane | near Garelochhead · Argyll and Bute | — | sustained | 109 m | 22 m | 19.8% | ≈30.3% | Needs confirmation |
| Clifton Hill | near Abertawe · West Glamorgan | — | sustained | 141 m | 34 m | 23.9% | 27.8% | High |
| Clun to Langford's Dingle° | near Clun · Shropshire | — | sustained | 2036 m | 80 m | 3.9% | 21.3% | High |
| Clynnog Fawr to Bwlch Mawr° | near Clynnog Fawr · Gwynedd | — | stepped | 3170 m | 192 m | 6.1% | 22.8% | High |
| Cnoc na Grèine to Achnaslishaig Hill° | near Glen Remuil · Argyll and Bute | — | sustained | 1048 m | 100 m | 9.5% | 25.9% | Needs confirmation |
| Co-operation Street | near Rake Foot · Lancashire | — | sustained | 396 m | 47 m | 11.8% | ≈24.8% | Needs confirmation |
| Coal Road | near Cowgill · Cumbria | — | sustained | 3976 m | 302 m | 7.6% | ≈20.6% | Good |
| Coal Road | near Garsdale Head · Cumbria | — | sustained | 2222 m | 215 m | 9.7% | 21.9% | Good |
| Coalmire Lane | near Swainby · North Yorkshire | — | stepped | 2249 m | 137 m | 6.1% | 21.2% | High |
| Cobbler's Park | near Combe Martin · Devon | — | sustained | 228 m | 39 m | 17.0% | 27.7% | Needs confirmation |
| Cock's Lake Lane | near Landrake · Cornwall | — | sustained | 1859 m | 60 m | 3.2% | 21.1% | Needs confirmation |
| Coedanghred Hill to Maypole° | near Llanrothal · Herefordshire | — | sustained | 3151 m | 75 m | 2.4% | 22.2% | High |
| Coleford Hill | near Coleford Bottom · Devon | — | stepped | 2083 m | 141 m | 6.8% | 29.1% | Good |
| Collaton Road | near Malborough · Devon | — | sustained | 578 m | 48 m | 8.3% | 22.6% | High |
| Collin to Carthat Hill° | near Collin · Dumfries and Galloway | — | sustained | 3707 m | 196 m | 5.3% | 16.1% | Good |
| Colly Cliff to Calstock° | near Colly Cliff · Cornwall | — | stepped | 715 m | 50 m | 7.0% | ≈20.9% | Good |
| Colstrope Lane | near Pheasant's Hill · Buckinghamshire | — | stepped | 1790 m | 108 m | 6.0% | 26.0% | Good |
| Colton Hill | near Spark Bridge · Cumbria | — | sustained | 452 m | 71 m | 15.7% | 23.1% | High |
| Colwell to Widworthy Hill° | near Colwell · Devon | — | sustained | 2610 m | 128 m | 4.9% | 20.5% | Good |
| Colwell to Widworthy Hill° | near Colwell · Devon | — | sustained | 3664 m | 112 m | 3.1% | ≈20.5% | Good |
| Combe to The Glen° | near Combe · Devon | — | stepped | 1630 m | 87 m | 5.3% | 23.6% | Good |
| Combe to Wallaford Down° | near Combe · Devon | — | sustained | 1522 m | 159 m | 10.4% | 26.9% | High |
| Combe to West Soar° | near Salcombe · Devon | — | stepped | 1174 m | 81 m | 6.9% | 21.3% | High |
| Commin Road | near Bargod · Gwent | — | stepped | 1344 m | 119 m | 8.9% | 21.0% | High |
| Commins Coch to Darowen° | near Commins Coch · Powys | — | sustained | 2468 m | 119 m | 4.8% | 26.5% | Good |
| Constantine to Brillwater° | near Constantine · Cornwall | — | sustained | 1139 m | 70 m | 6.2% | 20.4% | Needs confirmation |
| Constitution Hill | near Abertawe · West Glamorgan | Wikipedia3, 100 Climbs1 | sustained | 348 m | 61 m | 17.4% | 21.9% | High |
| Coombe to Hewas Water° | near Coombe · Cornwall | — | stepped | 1444 m | 80 m | 5.5% | ≈20.2% | Good |
| Coombesdale | near Stableford · Staffordshire | — | stepped | 1762 m | 72 m | 4.1% | 23.0% | Good |
| Cooper's Pitch | near Houndscroft · Gloucestershire | — | sustained | 150 m | 20 m | 13.6% | 22.1% | High |
| Cop Hill Side | near Lingards Wood | — | stepped | 1953 m | 171 m | 8.8% | 25.3% | Good |
| Cophill to Perry Hill° | near Eaton Bishop · Herefordshire | — | stepped | 1556 m | 53 m | 3.4% | ≈20.7% | Good |
| Copplesbury Lane | near Bruton · Somerset | — | stepped | 1531 m | 46 m | 3.0% | ≈20.2% | Good |
| Coral Haven to Litterty Hill° | near Pennan · Aberdeenshire | — | sustained | 2722 m | 187 m | 6.9% | ≈20.0% | Good |
| Coronation Street | near Wyndham · Mid Glamorgan | — | stepped | 307 m | 35 m | 11.4% | 29.6% | High |
| Cot Hill | near Ponsanooth · Cornwall | — | sustained | 1090 m | 94 m | 8.6% | 21.8% | Needs confirmation |
| Cot Valley to Kelynack° | near St Just · Cornwall | — | sustained | 868 m | 42 m | 4.8% | ≈21.6% | Needs confirmation |
| Cote Lane | near Meerbrook · Staffordshire | — | sustained | 4107 m | 217 m | 5.3% | 23.1% | High |
| Cotley Lane | near Dunsford · Devon | — | sustained | 2920 m | 129 m | 4.4% | 28.3% | Good |
| Couch's Mill to Bury Down° | near Couch's Mill · Cornwall | — | stepped | 3388 m | 120 m | 3.5% | 25.7% | High |
| Court Henry to Llanfynydd° | near Court Henry · Dyfed | — | sustained | 4573 m | 185 m | 4.0% | ≈20.2% | Good |
| Cove to Dry Hill° | near Cove · Devon | — | sustained | 1622 m | 152 m | 9.4% | 21.0% | High |
| Cowlow Lane | near Combs · Derbyshire | — | stepped | 2493 m | 155 m | 6.2% | 20.5% | Needs confirmation |
| Cox Hill to Blackdown Hill° | near Curtisknowle · Devon | — | sustained | 2097 m | 153 m | 7.3% | ≈23.4% | Good |
| Cox Hill to Curtisknowle° | near Curtisknowle · Devon | — | stepped | 2309 m | 125 m | 5.4% | ≈23.7% | Good |
| Crackington Haven to Middle Crackington° | near Crackington Haven · Cornwall | — | sustained | 1663 m | 127 m | 7.7% | 24.4% | Good |
| Craigs Bank | near Kellah · Northumberland | — | stepped | 956 m | 57 m | 6.0% | 23.8% | Good |
| Cranford Road | near Shorton · Devon | — | stepped | 1087 m | 82 m | 7.6% | 20.4% | High |
| Creigiau'r Llyn to Foel Y Groes° | near Cwm Eunant · Powys | — | sustained | 6349 m | 286 m | 4.5% | ≈19.7% | Good |
| Cribden End Lane | near Haslingden · Lancashire | — | sustained | 1577 m | 88 m | 5.6% | 20.3% | High |
| Crimea Pass (Bwlch y Gorddinan) | near Blaenau Ffestiniog · Gwynedd | Wikipedia3, Warren app4 | sustained | 2705 m | 260 m | 9.6% | ≈18.4% | Needs confirmation |
| Croesau Bach to Craig-llwyn° | near Croesau Bach · Shropshire | — | stepped | 2806 m | 72 m | 2.6% | 22.1% | High |
| Croesau Bach to Mynydd Myfyr° | near Trefonen · Shropshire | — | stepped | 1682 m | 44 m | 2.6% | 20.3% | High |
| Croesau Bach to Pentre-cefn° | near Croesau Bach · Shropshire | — | stepped | 3368 m | 149 m | 4.4% | 22.8% | High |
| Croftown to Corrieshalloch Gorge° | near Croftown · Highland | — | stepped | 7363 m | 174 m | 2.4% | ≈12.3% | Good |
| Crook Hill to Orblis Hill° | near Lochwinnoch · Renfrewshire | — | sustained | 4836 m | 159 m | 3.3% | ≈10.3% | Good |
| Cross Top | near Muker · North Yorkshire | — | stepped | 1453 m | 101 m | 6.9% | 23.8% | Good |
| Crosscrake to Oxenholme° | near Barrows Green · Cumbria | — | sustained | 2961 m | 84 m | 2.8% | 21.9% | High |
| Crosshill to Meikle Hill° | near Crosshill · South Ayrshire | — | sustained | 4382 m | 175 m | 4.0% | ≈20.0% | Needs confirmation |
| Crossway to Tyn Green Castle° | near Crossway · Powys | — | stepped | 2848 m | 112 m | 3.9% | 22.1% | High |
| Crow Road | near Lennoxtown · East Dunbartonshire | — | sustained | 3439 m | 217 m | 6.3% | ≈12.3% | Good |
| Crow Tree Lane | near Fairweather Green | — | stepped | 593 m | 43 m | 7.2% | 20.8% | Good |
| Crowcombe Road | near Nether Stowey · Somerset | — | stepped | 4140 m | 214 m | 5.2% | 20.8% | High |
| Crowthers Pool | near Rhydspence · Herefordshire | — | sustained | 2452 m | 198 m | 8.1% | 25.0% | Needs confirmation |
| Cruwy's Morchard Mill Lane | near Withleigh · Devon | — | sustained | 1579 m | 130 m | 8.2% | 22.2% | High |
| Cullochrig Road | near Douglas Glen · North Lanarkshire | — | stepped | 394 m | 29 m | 7.5% | ≈26.2% | Good |
| Cusop Dingle to Maerdy Dingle° | near Cusop · Herefordshire | — | sustained | 3617 m | 181 m | 5.0% | ≈21.6% | Needs confirmation |
| Cwm Dulais to Cwm Ysgiach° | near Cwm Dulais · West Glamorgan | — | stepped | 1908 m | 39 m | 2.0% | 27.1% | High |
| Cwm Ffrydlan to Bryn Mawr° | near Cwm Ffrydlan · Powys | — | stepped | 3364 m | 193 m | 5.8% | ≈27.0% | Good |
| Cwm Glas to Pen Lan-fawr° | near Cwm Glas · Dyfed | — | sustained | 3263 m | 179 m | 5.5% | ≈21.1% | Needs confirmation |
| Cwm Golau to Babel° | near Cwm Golau · Dyfed | — | sustained | 5485 m | 118 m | 2.2% | 23.1% | Good |
| Cwm Llwynau to Cwm Cnyw° | near Hafodyrynys · Gwent | — | stepped | 1135 m | 70 m | 6.2% | ≈26.8% | Good |
| Cwm Rhiwiau to Llandyfalle Hill° | near Cwm Rhiwiau · Powys | — | stepped | 2066 m | 92 m | 4.4% | 22.3% | Good |
| Cwm Road | near Abbey Dore · Herefordshire | — | stepped | 1636 m | 107 m | 6.5% | 21.1% | High |
| Cwm Sŷch to Cwm Dyfnant | near Llanfair-ym-Muallt · Powys | — | sustained | 2681 m | 177 m | 6.6% | ≈26.4% | Good |
| Cwm Wern-ddu to Llanfihangel-y-Creuddyn° | near Cwm Wern-ddu · Dyfed | — | sustained | 1549 m | 98 m | 6.3% | ≈20.1% | Good |
| Cwm y Gâth to Bryn-y-Fedwen | near Cwm y Gâth · Powys | — | sustained | 8271 m | 456 m | 5.5% | 22.6% | Needs confirmation |
| Cwm-hirblyg to Glyn Llydan° | near Cwm-hirblyg · Dyfed | — | sustained | 2890 m | 96 m | 3.3% | ≈26.7% | Good |
| Cwm-hirblyg to Pen Rhiw-Wen° | near Cwm-hirblyg · Dyfed | — | sustained | 5282 m | 272 m | 5.2% | 18.7% | Good |
| Cwmystwyth to Bryn Bach° | near Cwmystwyth · Dyfed | — | sustained | 2458 m | 134 m | 5.4% | 22.9% | Needs confirmation |
| Cwrdy Lane | near Sebastopol · Gwent | — | stepped | 1757 m | 158 m | 9.0% | ≈28.7% | Good |
| Cyffredyn to Blaen Onneu° | near Llangynidr · Powys | — | sustained | 4794 m | 323 m | 6.7% | 16.2% | Good |
| Dabdike Stones to Runswick Bay° | near Runswick Bay · North Yorkshire | — | sustained | 398 m | 71 m | 17.7% | 25.2% | High |
| Dalton to Weather Hill° | near Dalton · North Yorkshire | — | sustained | 2338 m | 151 m | 6.5% | 20.3% | Good |
| Damson Hill | near Dundridge · Hampshire | — | stepped | 1675 m | 66 m | 3.9% | 22.4% | High |
| Daneway to Waterlane° | near Sapperton · Gloucestershire | — | sustained | 2800 m | 94 m | 3.3% | 25.6% | Needs confirmation |
| Dardy to Blaen Onneu° | near Crughywel · Powys | — | sustained | 6272 m | 328 m | 5.2% | ≈23.2% | Good |
| Darkie Hill | near Battisborough Cross · Devon | — | sustained | 341 m | 40 m | 11.8% | 23.1% | High |
| David Street | near Pontycymer · Mid Glamorgan | — | sustained | 808 m | 51 m | 6.3% | 21.1% | High |
| Deanhill Lane | near Upper Weston · Somerset | — | stepped | 545 m | 59 m | 10.8% | 22.9% | Good |
| Deers Hill to Higher Hill° | near Kennford · Devon | — | sustained | 3746 m | 181 m | 4.8% | 20.8% | Good |
| Derwen Lane | near Glanwydden · Clwyd | — | stepped | 1188 m | 78 m | 6.5% | 27.2% | High |
| Devil's Staircase | near Coed Nant-yr-hwch · Powys | Another 1005, 100 Climbs1 | sustained | 841 m | 111 m | 13.2% | 24.5% | High |
| Devil's Staircase (west side) | near Coed Nant-yr-hwch · Powys | tag: 25% (2026) | stepped | 2348 m | 181 m | 7.7% | 22.3% | High |
| Dinas Oleu Lane | near Abermaw · Gwynedd | — | sustained | 198 m | 43 m | 21.5% | ≈29.4% | Good |
| Discoed to Upper Dunn's Plantation° | near Discoed · Powys | — | stepped | 2144 m | 164 m | 7.7% | ≈26.2% | Good |
| Discovered lane (54.1595, -6.3391) | near Newry · County Down | — | stepped | 346 m | 29 m | 8.3% | 28.9% | High |
| Discovered lane (54.1924, -6.3316) | near Newry · County Down | — | sustained | 137 m | 26 m | 19.2% | 27.4% | High |
| Dittisham to Capton° | near Dittisham · Devon | — | stepped | 3211 m | 156 m | 4.8% | ≈22.3% | Needs confirmation |
| Dockins Hill Way | near Plump Hill · Gloucestershire | — | sustained | 622 m | 54 m | 8.8% | ≈22.4% | Good |
| Dole to Broginin° | near Dole · Dyfed | — | sustained | 1479 m | 81 m | 5.5% | 21.4% | Needs confirmation |
| Dolhendre to Carndochan° | near Rhosdylluan · Gwynedd | — | sustained | 642 m | 53 m | 8.3% | ≈26.5% | Good |
| Donkey Lane | near Millbrook · Cornwall | — | sustained | 1171 m | 93 m | 7.9% | 24.0% | Needs confirmation |
| Douglas Street | near Broomielaw · Glasgow City | — | sustained | 411 m | 32 m | 7.9% | 20.1% | Good |
| Doverhay | near Porlock · Somerset | — | sustained | 2355 m | 239 m | 10.2% | 28.4% | Needs confirmation |
| Down Hill to Myrehaugh Hill° | near Fossoway · Perth and Kinross | — | sustained | 1360 m | 58 m | 4.3% | ≈22.1% | Needs confirmation |
| Downaway Lane | near Coffinswell · Devon | — | stepped | 1712 m | 116 m | 6.8% | 20.9% | Good |
| Draycott Cross Road | near Brookhouses · Staffordshire | — | stepped | 1109 m | 84 m | 7.6% | 20.0% | Good |
| Drift Lane | near West Taphouse · Cornwall | — | sustained | 968 m | 54 m | 5.6% | 20.8% | Good |
| Drumber Lane | near The Bank · Cheshire | — | sustained | 1037 m | 96 m | 9.2% | 21.4% | Good |
| Drummochy to New Gilston° | near Lower Largo · Fife | — | sustained | 5799 m | 181 m | 3.1% | 14.3% | High |
| Drymump Hill | near Meshaw · Devon | — | sustained | 336 m | 46 m | 13.7% | ≈22.6% | Needs confirmation |
| Dukewood Road | near Scissett | — | stepped | 468 m | 30 m | 6.5% | 22.8% | High |
| Duncart Lane | near Croscombe · Somerset | — | stepped | 986 m | 70 m | 7.1% | ≈26.4% | Good |
| Duncombe Street | near Upperthorpe | — | sustained | 1158 m | 112 m | 9.7% | 20.0% | High |
| Dundee Lane | near Ramsbottom | — | stepped | 986 m | 77 m | 7.9% | ≈21.7% | Good |
| Dunder Hole to Mortehoe° | near Mortehoe · Devon | — | stepped | 488 m | 39 m | 8.1% | 20.2% | High |
| Dunsford to Holcombe Burnell° | near Dunsford · Devon | — | stepped | 4694 m | 126 m | 2.7% | 20.2% | Good |
| Dunsley Hill | near West Anstey · Devon | — | sustained | 1635 m | 72 m | 4.4% | 21.4% | High |
| Dunsley Lane | near Sandsend · North Yorkshire | — | sustained | 5172 m | 208 m | 4.0% | 20.9% | Good |
| Dutlas to Hurgin° | near Dutlas · Powys | — | stepped | 5614 m | 186 m | 3.3% | 21.5% | Good |
| Dyffryn Conwy to Mynydd Cauedig | near Dyffryn Conwy · Clwyd | — | sustained | 1784 m | 176 m | 9.9% | ≈26.8% | Good |
| Easebourne Street | near Bexleyhill · West Sussex | — | sustained | 474 m | 60 m | 12.7% | 29.5% | Good |
| East Cornworthy to Cornworthy° | near Cornworthy · Devon | — | stepped | 911 m | 50 m | 5.5% | ≈25.9% | Good |
| East Helmsdale to Creag Marail° | near East Helmsdale · Highland | — | sustained | 2446 m | 160 m | 6.6% | ≈17.1% | Needs confirmation |
| East Taphouse to St Pinnock° | near East Taphouse · Cornwall | — | sustained | 518 m | 74 m | 14.2% | ≈22.5% | Needs confirmation |
| Easterside Lane | near Hawnby · North Yorkshire | — | stepped | 825 m | 61 m | 7.4% | 26.1% | High |
| Easton Hollow | near Berwick St John · Wiltshire | — | sustained | 1296 m | 100 m | 7.7% | 21.6% | High |
| Easton to West Alvington° | near West Alvington · Devon | — | sustained | 443 m | 54 m | 12.2% | ≈23.8% | Needs confirmation |
| Eastwood Lane | near Littlemoor · Derbyshire | — | stepped | 1008 m | 83 m | 8.3% | 24.4% | High |
| Eastwood Road | near Upper Eastwood | — | stepped | 3003 m | 146 m | 4.9% | 22.8% | High |
| Eisingrug to Moel y Geifr° | near Eisingrug · Gwynedd | — | sustained | 2149 m | 217 m | 10.1% | ≈22.0% | Good |
| Ellen Royd Lane | near Luddenden Foot | — | sustained | 773 m | 81 m | 10.5% | ≈23.6% | Good |
| Ellerby Bank | near Ellerby · North Yorkshire | — | sustained | 1044 m | 75 m | 7.2% | 24.3% | Needs confirmation |
| Ellers Road | near Sutton-in-Craven · North Yorkshire | — | sustained | 2139 m | 230 m | 10.8% | 20.6% | Good |
| Ermington to Westlake° | near Ermington · Devon | — | stepped | 1239 m | 92 m | 7.4% | 20.2% | Good |
| Erwyd to Llangynog | near Erwyd · Powys | — | sustained | 5937 m | 308 m | 5.2% | ≈18.9% | Good |
| Esdale Law to Harden Glen° | near White Cleuch · Scottish Borders | — | sustained | 2926 m | 173 m | 5.9% | 13.8% | Good |
| Evelith Lane | near Kemberton · Shropshire | — | sustained | 1672 m | 37 m | 2.2% | ≈26.1% | Needs confirmation |
| Ewood Hall Avenue | near Brearley | — | sustained | 371 m | 39 m | 10.4% | 20.8% | High |
| Ewood Lane | near Ewood Bridge · Lancashire | — | sustained | 448 m | 42 m | 9.5% | 23.9% | Needs confirmation |
| Exton Lane | near Bridgetown · Somerset | — | stepped | 1712 m | 152 m | 8.9% | ≈24.0% | Good |
| Fairfield Avenue | near Larkhall · Somerset | — | sustained | 616 m | 69 m | 11.2% | 20.8% | High |
| Fairview Road | near Dartmouth · Devon | — | sustained | 1101 m | 103 m | 9.3% | ≈24.8% | Good |
| Falstone to White Side° | near Falstone · Northumberland | — | sustained | 1223 m | 59 m | 4.8% | 20.2% | High |
| Farleigh Hungerford to Lower Westwood° | near Farleigh Hungerford · Somerset | — | stepped | 1616 m | 36 m | 2.2% | 22.5% | High |
| Farm Road | near Edgeworth · Gloucestershire | — | stepped | 1214 m | 92 m | 7.6% | 22.3% | Good |
| Feetham to Cringley Hill° | near Feetham · North Yorkshire | — | stepped | 2884 m | 162 m | 5.6% | ≈21.0% | Good |
| Feetham to Low Row° | near Feetham · North Yorkshire | — | sustained | 1367 m | 119 m | 8.7% | 24.0% | High |
| Felindre to Cwm Hyfryd° | near Felindre · Dyfed | — | sustained | 5214 m | 262 m | 5.0% | ≈17.6% | Good |
| Felindre to Pen y Garn° | near Felindre · Powys | — | stepped | 2165 m | 167 m | 7.7% | 20.8% | Good |
| Fell Road | near Casterton · Cumbria | — | sustained | 2839 m | 222 m | 7.8% | 20.3% | High |
| Ffordd Bryn Fran | near Eglwysbach · Clwyd | — | sustained | 2943 m | 292 m | 9.9% | ≈28.1% | Good |
| Ffordd Eisteddfod | near Gwynfryn · Clwyd | — | sustained | 1262 m | 56 m | 4.4% | 22.1% | Good |
| Ffordd Gerlan | near Bethesda · Gwynedd | — | sustained | 608 m | 61 m | 10.0% | 22.1% | Good |
| Ffordd Llwyn Du | near Eglwysbach · Clwyd | — | sustained | 1494 m | 182 m | 12.2% | 28.3% | Good |
| Ffordd Pen Llech | near Harlech · Gwynedd | Guinness6, Wikipedia3, 100 Climbs1 | sustained | 237 m | 41 m | 17.2% | ≈32.6% | Good |
| Ffordd Rhiwlas | near Eglwysbach · Clwyd | — | stepped | 2601 m | 159 m | 6.1% | ≈26.5% | Good |
| Ffordd y Graig | near Pontardawe · West Glamorgan | — | sustained | 1632 m | 173 m | 10.6% | ≈26.2% | Good |
| Ffordd-las to Hay Bluff | — | sustained | 6920 m | 294 m | 4.3% | ≈31.9% | Good | |
| Ffordd-las to Tregoyd° | near Ffordd-las · Powys | — | sustained | 2018 m | 62 m | 3.1% | 20.5% | Good |
| Fforest Road | near Mountain Ash · Mid Glamorgan | — | sustained | 925 m | 115 m | 12.5% | ≈26.8% | Good |
| Filford Lane | near Filford · Dorset | — | sustained | 1652 m | 99 m | 6.0% | 20.3% | Good |
| Finch Lane | near Appley Bridge · Lancashire | — | stepped | 611 m | 23 m | 3.8% | 25.4% | High |
| Finwick's Knowe to Dobbingstone Hill° | near Falfarrocher Glen · South Ayrshire | — | sustained | 2830 m | 170 m | 6.0% | ≈18.5% | Needs confirmation |
| Fish-in-the-Well Rock to Signalhouse Point° | near Fish-in-the-Well Rock · Devon | — | sustained | 409 m | 54 m | 13.3% | 21.2% | High |
| Flan Hill to Knottallow Hill° | near Ulverston · Cumbria | — | sustained | 2047 m | 167 m | 8.2% | 21.9% | High |
| Flash to Oliver Hill° | near Flash · Staffordshire | — | stepped | 1042 m | 57 m | 5.5% | 23.0% | High |
| Flint Lane | near Lenham · Kent | — | stepped | 2114 m | 58 m | 2.8% | 20.0% | Needs confirmation |
| Florence Hill | near Callington · Cornwall | — | stepped | 727 m | 62 m | 8.5% | 21.9% | High |
| Ford Hill | near Woodland Head · Devon | — | stepped | 1553 m | 89 m | 5.7% | 26.1% | High |
| Ford Hill | near Thorverton · Devon | — | sustained | 2165 m | 151 m | 7.0% | 25.1% | High |
| Ford Hill to Berry Down° | near East Down · Devon | — | stepped | 2817 m | 110 m | 3.9% | 21.3% | Good |
| Ford Hill to East Down° | near East Down · Devon | — | sustained | 740 m | 69 m | 9.3% | 21.3% | Needs confirmation |
| Ford Street | near Wellington · Somerset | — | stepped | 3299 m | 201 m | 6.1% | 22.1% | Good |
| Forda to North Brentor° | near Chillaton · Devon | — | stepped | 3139 m | 116 m | 3.7% | 22.8% | Needs confirmation |
| Forder to Throwleigh° | near Throwleigh · Devon | — | stepped | 1596 m | 59 m | 3.7% | 22.8% | Needs confirmation |
| Forefield Rise | near Bath · Somerset | — | sustained | 323 m | 43 m | 13.3% | 22.7% | High |
| Forge Hill | near Lower Lydbrook · Gloucestershire | — | sustained | 1767 m | 141 m | 8.0% | 21.6% | Needs confirmation |
| Forge Lane | near Much Birch · Herefordshire | — | sustained | 1295 m | 72 m | 5.6% | 22.4% | High |
| Forra Bury Hill | near Boscastle · Cornwall | — | sustained | 1030 m | 81 m | 7.9% | 23.8% | High |
| Forty Acre Lane | near Hesketh Lane · Lancashire | — | sustained | 2388 m | 177 m | 7.4% | 20.5% | High |
| Foxhole Lane | near Gorran Haven · Cornwall | — | sustained | 489 m | 66 m | 13.5% | 26.0% | High |
| Freda Avenue | near Gedling · Nottinghamshire | — | stepped | 433 m | 42 m | 9.6% | 26.7% | High |
| Fricker's Lane | near Ridge · Wiltshire | — | sustained | 714 m | 42 m | 5.8% | 23.1% | Good |
| Frogmarsh Lane | near St Chloe · Gloucestershire | — | sustained | 564 m | 45 m | 8.0% | 25.1% | High |
| Furnessford Road | near Green · Lancashire | — | sustained | 2230 m | 95 m | 4.2% | ≈26.2% | Needs confirmation |
| Fursdon Lane | near Furshamdown Bottom · Devon | — | stepped | 1284 m | 72 m | 5.6% | ≈21.9% | Good |
| Furzeleigh Lane | near Bovey Tracey · Devon | — | stepped | 3108 m | 213 m | 6.9% | 22.4% | Good |
| Game Scar Lane | near Goose Eye | — | sustained | 2066 m | 161 m | 7.8% | 20.4% | Good |
| Ganton Hill | near Ganton · North Yorkshire | — | sustained | 1415 m | 122 m | 8.6% | 23.7% | High |
| Garreg Side | near Pontycymer · Mid Glamorgan | — | sustained | 385 m | 46 m | 12.0% | 23.6% | Good |
| Garth to Cwmsymlog° | near Penrhyn-coch · Dyfed | — | sustained | 4880 m | 273 m | 5.6% | 18.5% | Needs confirmation |
| Gartymore to Creag Marail° | near West Helmsdale · Highland | — | sustained | 2160 m | 178 m | 8.2% | 20.6% | Good |
| Garvald to Redstone Rig° | near Garvald · East Lothian | — | sustained | 12978 m | 293 m | 2.3% | ≈19.8% | Needs confirmation |
| Gas Hill | near Norwich · Norfolk | — | sustained | 356 m | 40 m | 11.4% | ≈22.7% | Good |
| Gateside Road | near Borestone · Stirling | — | sustained | 5664 m | 208 m | 3.7% | ≈18.3% | Good |
| Gay's Hill | near Bath · Somerset | — | sustained | 487 m | 64 m | 13.1% | 24.2% | Needs confirmation |
| Gayle Lane | near Sleddale · North Yorkshire | — | sustained | 2906 m | 238 m | 8.2% | 21.9% | High |
| Georges Delight | near Llangwm · Gwent | — | stepped | 2215 m | 162 m | 7.3% | ≈26.4% | Good |
| Gibb Hill | near Lutton · Devon | — | sustained | 373 m | 44 m | 11.7% | 23.1% | Needs confirmation |
| Gidleigh to Scorhill Tor° | near Chagford · Devon | — | sustained | 2065 m | 174 m | 8.4% | 24.4% | Good |
| Gifford to Newlands Hill° | near Gifford · East Lothian | sign: 17% (2025) | sustained | 7483 m | 277 m | 3.7% | ≈21.1% | Needs confirmation |
| Gilboa | near Trecceln · Gwent | — | sustained | 342 m | 34 m | 10.0% | 20.0% | Good |
| Gissage Hill | near Zeal Monachorum · Devon | — | sustained | 551 m | 59 m | 10.7% | 22.2% | High |
| Gittisham to Westgate Hill° | near Gittisham · Devon | — | sustained | 1311 m | 110 m | 8.4% | ≈20.3% | Good |
| Gladestry to Hengoed | near Gladestry · Powys | — | stepped | 1821 m | 100 m | 5.5% | ≈26.5% | Needs confirmation |
| Glamorgan Street | near Penrhiwceiber · Mid Glamorgan | — | sustained | 1148 m | 113 m | 9.8% | 21.7% | High |
| Glyndyfrdwy to Moel Morfydd° | near Glyndyfrdwy · Clwyd | — | stepped | 3629 m | 279 m | 7.7% | 25.5% | Good |
| Glynmarch Street | near Deri · Gwent | — | sustained | 465 m | 39 m | 8.3% | 20.3% | Good |
| Goblin Hill | near Coleford · Devon | — | sustained | 300 m | 32 m | 10.6% | 20.1% | Good |
| Godson Lane | near Napton on the Hill · Warwickshire | — | sustained | 402 m | 31 m | 7.8% | 20.9% | Good |
| Golden Grove | near Ruswarp · North Yorkshire | — | sustained | 268 m | 28 m | 10.5% | 21.6% | High |
| Goodshelter to Rickham° | near Salcombe · Devon | — | sustained | 1551 m | 132 m | 8.5% | ≈26.5% | Good |
| Goose Nest Lane | near Sowerby Bridge | — | sustained | 1482 m | 150 m | 10.1% | 24.3% | Good |
| Goveton to Cole's Cross° | near Goveton · Devon | — | stepped | 2576 m | 119 m | 4.6% | ≈23.6% | Good |
| Govilon to Gilwern Hill° | near Govilon · Gwent | — | sustained | 1788 m | 187 m | 10.5% | ≈22.2% | Good |
| Green Park Hill to Talebrigg Hill° | near Middleton · Cumbria | — | sustained | 1403 m | 112 m | 8.0% | 20.3% | Good |
| Greenfield Place | near Blaenavon · Gwent | — | sustained | 600 m | 48 m | 7.9% | 22.3% | High |
| Greenway Hill to Week Bottom° | near Great Torrington · Devon | — | stepped | 2450 m | 98 m | 4.0% | 20.2% | Good |
| Grey Grass Dingle to Middleton Hill° | near Grey Grass Dingle · Shropshire | — | sustained | 1573 m | 79 m | 5.0% | 21.7% | Needs confirmation |
| Greystones Road | near Luddenden Foot | — | sustained | 1765 m | 183 m | 10.3% | 21.3% | Needs confirmation |
| Guildford Lane | near Albury · Surrey | — | sustained | 1244 m | 51 m | 4.1% | ≈26.5% | Needs confirmation |
| Gully to Pen y Ffynnon° | near Gully · Powys | — | stepped | 1677 m | 125 m | 7.5% | 27.5% | High |
| Gunnislake to Gulworthy° | near Gunnislake · Cornwall | — | sustained | 1503 m | 160 m | 10.6% | ≈18.7% | Needs confirmation |
| Gunridge | near Clunton · Shropshire | — | stepped | 2960 m | 150 m | 5.1% | 21.0% | Good |
| Gwaelodygarth Road | near Merthyr Tydfil · Mid Glamorgan | — | sustained | 1356 m | 86 m | 6.3% | 21.0% | Good |
| Gwenddwr to Crickadarn° | near Gwenddwr · Powys | — | sustained | 4331 m | 70 m | 1.6% | 22.2% | Good |
| Gwyddelwern to Betws Gwerful Goch | near Gwyddelwern · Clwyd | — | sustained | 3132 m | 164 m | 5.3% | ≈26.2% | Good |
| Gwytherin to Oerfa° | near Gwytherin · Clwyd | — | stepped | 5856 m | 148 m | 2.5% | ≈21.9% | Good |
| Gydynap Lane | near Theescombe · Gloucestershire | — | sustained | 452 m | 89 m | 19.7% | ≈28.0% | Needs confirmation |
| Hackney | near Corscombe · Dorset | — | stepped | 1672 m | 124 m | 7.4% | 22.2% | Good |
| Hafod Lane | near Hopkinstown · Mid Glamorgan | — | sustained | 2898 m | 130 m | 4.5% | ≈27.3% | Good |
| Hafod-fan Road | near Abertyleri · Gwent | — | sustained | 181 m | 31 m | 17.0% | 20.4% | High |
| Hale Lane | near Wendover · Buckinghamshire | — | sustained | 777 m | 68 m | 8.7% | 24.9% | High |
| Hall Hill | near Brendon · Devon | — | sustained | 1779 m | 130 m | 7.3% | ≈20.2% | Needs confirmation |
| Hall Ing Road | near Honley | — | sustained | 1921 m | 143 m | 7.5% | 21.0% | Good |
| Halswell Street | near Tyntetown · Mid Glamorgan | — | sustained | 163 m | 21 m | 12.7% | 20.7% | High |
| Hammetts Lane | near Rumsam · Devon | — | sustained | 481 m | 52 m | 10.8% | ≈26.3% | Needs confirmation |
| Hand Bank Lane | near Mirfield | — | sustained | 477 m | 56 m | 11.7% | 23.0% | High |
| Hangman's Hill | near Oakford · Devon | — | stepped | 1532 m | 101 m | 6.6% | ≈27.0% | Good |
| Hangman's Hill to Pope's Hill° | near Pope's Hill · Gloucestershire | — | stepped | 695 m | 57 m | 8.2% | 21.5% | Good |
| Harberton to Belsford° | near Harberton · Devon | — | sustained | 847 m | 73 m | 8.6% | ≈21.5% | Good |
| Hard Hill to Bigert° | near Ulpha · Cumbria | — | sustained | 1340 m | 150 m | 11.2% | 23.5% | High |
| Hardknott Pass | near Eskdale · Cumbria | 100 Climbs1, Wikipedia3 | sustained | 3119 m | 315 m | 10.1% | 25.9% | Good |
| Hardknott Pass (west) | near Cockley Beck · Cumbria | — | sustained | 911 m | 50 m | 5.5% | 28.2% | Good |
| Hardraw to Pike Hill° | near Hardraw · North Yorkshire | — | sustained | 3544 m | 224 m | 6.3% | 20.4% | High |
| Harford to Hutcherton Down° | near Landkey · Devon | — | stepped | 3839 m | 172 m | 4.5% | 20.1% | Needs confirmation |
| Harper's Lane | near Roadwater · Somerset | — | sustained | 642 m | 85 m | 13.2% | ≈30.7% | Good |
| Hart Hill | near Charing · Kent | — | stepped | 1024 m | 56 m | 5.4% | 22.4% | High |
| Harwood Farm Lane | near Langley Marsh · Somerset | — | sustained | 1706 m | 127 m | 7.4% | 26.5% | High |
| Hatch to Churchstow° | near Hatch · Devon | — | sustained | 1281 m | 103 m | 8.0% | ≈22.3% | Needs confirmation |
| Haw Hill to Potherilt Hill° | near Broughton in Furness · Cumbria | — | sustained | 823 m | 123 m | 14.9% | ≈25.0% | Good |
| Haw Hill to The Knott° | near Broughton in Furness · Cumbria | — | sustained | 5736 m | 236 m | 4.1% | 21.1% | High |
| Hawkley Road | near West Liss · Hampshire | — | stepped | 1535 m | 68 m | 4.4% | ≈21.1% | Good |
| Hay on Wye to Mynydd Brith° | near Y Gelli Gandryll · Powys | — | sustained | 6042 m | 332 m | 5.5% | 20.8% | High |
| Hearn Lane | near North Barrow · Somerset | — | stepped | 1691 m | 65 m | 3.9% | 20.2% | Good |
| Heartsease to Wern Dingle° | near Heartsease · Powys | — | sustained | 3120 m | 157 m | 5.0% | 20.2% | High |
| Hebden Road | near Hebden · North Yorkshire | — | stepped | 1054 m | 73 m | 6.9% | ≈28.4% | Needs confirmation |
| Height Lane | near Oxenhope | — | stepped | 1160 m | 54 m | 4.6% | 20.2% | High |
| Hellwell Lane | near Kentmere · Cumbria | — | sustained | 628 m | 72 m | 11.5% | 22.9% | Good |
| Hen Ffordd | near Bwlch · Powys | — | sustained | 419 m | 40 m | 9.4% | ≈21.0% | Good |
| Hendre Owen Road | near Duffryn · West Glamorgan | — | sustained | 309 m | 46 m | 15.0% | 23.1% | High |
| Henllys to Nant Carn° | near Ty Canol · Gwent | — | sustained | 1553 m | 187 m | 12.1% | ≈25.4% | Good |
| Heol Calch | near Cwm Gored · Powys | — | stepped | 925 m | 86 m | 9.3% | ≈26.0% | Good |
| Heol Callwen | near Glyntawe · Powys | — | stepped | 492 m | 29 m | 5.9% | 22.0% | Good |
| Heol Feurig | near Dolgellau · Gwynedd | — | stepped | 284 m | 33 m | 11.5% | ≈30.0% | Good |
| Heol Lan | near Trecastle · Powys | — | stepped | 2788 m | 142 m | 5.1% | ≈26.3% | Good |
| Heol Lan | near Cwm Nantypistyll · Powys | — | sustained | 8767 m | 135 m | 1.5% | 23.1% | Good |
| Heol y Banc | near Pontyberem · Dyfed | — | sustained | 1670 m | 164 m | 9.8% | 21.9% | High |
| Herodsfoot to St Keyne° | near Herodsfoot · Cornwall | — | stepped | 2106 m | 113 m | 5.3% | 26.3% | High |
| Herodsfoot to St Keyne° | near Herodsfoot · Cornwall | — | stepped | 1959 m | 110 m | 5.6% | ≈23.2% | Good |
| Heron Hill Lane | near South Street · Kent | — | stepped | 1088 m | 41 m | 3.8% | 20.9% | Good |
| Hessenford to Trelowia° | near Hessenford · Cornwall | — | sustained | 1166 m | 103 m | 8.9% | 23.1% | Needs confirmation |
| Hey Lane | near Banquet House Clough | — | sustained | 2478 m | 195 m | 7.9% | 30.6% | Good |
| High Hill Lane | near Settle · North Yorkshire | — | sustained | 812 m | 116 m | 14.3% | 20.4% | High |
| High Meadow to Hafodyrynys° | near Abercarn · Gwent | — | stepped | 4325 m | 266 m | 6.1% | ≈24.0% | Good |
| Higham Lane | near Gee Cross | — | sustained | 1281 m | 83 m | 6.5% | 21.0% | High |
| Higher Ashton to Beardon Hill° | near Higher Ashton · Devon | — | sustained | 1336 m | 84 m | 6.3% | ≈27.3% | Good |
| Higher Ashton to Dunchideock° | near Higher Ashton · Devon | — | sustained | 2606 m | 174 m | 6.7% | 21.8% | Needs confirmation |
| Higher Buckeridge Road | near Teignmouth · Devon | — | sustained | 1526 m | 163 m | 10.7% | 23.2% | High |
| Higher Dinting | near Glossop · Derbyshire | — | sustained | 197 m | 24 m | 12.2% | 20.0% | High |
| Higher Slade Road | near Ilfracombe · Devon | — | sustained | 947 m | 76 m | 8.0% | 21.4% | High |
| Higher Woodway Road | near Teignmouth · Devon | — | sustained | 1394 m | 129 m | 9.2% | 22.1% | High |
| Hill Road | near Broughty Ferry · Dundee City | — | sustained | 519 m | 50 m | 9.7% | 20.1% | Good |
| Hill Street | near Deri · Gwent | — | sustained | 1697 m | 146 m | 8.6% | 27.9% | High |
| Hill Terrace | near Abergwaun · Dyfed | — | sustained | 589 m | 58 m | 9.8% | 15.0% | High |
| Hill's Lane | near Cotleigh · Devon | — | stepped | 1102 m | 66 m | 6.0% | 26.3% | High |
| Hillside | — | sustained | 729 m | 89 m | 12.2% | ≈20.2% | Good | |
| Hillside | near Prestatyn · Clwyd | — | sustained | 801 m | 132 m | 16.5% | 24.6% | High |
| Hillside Road | near Lower Redbrook · Gloucestershire | — | sustained | 325 m | 37 m | 11.4% | 22.0% | High |
| Hillside Road | near Lower Redbrook · Gloucestershire | — | sustained | 326 m | 37 m | 11.3% | 21.8% | Good |
| Hilltop to Easthope° | near Easthope · Shropshire | — | sustained | 899 m | 103 m | 11.5% | ≈24.9% | Good |
| Hines Hill to East Prawle° | near East Prawle · Devon | — | stepped | 426 m | 33 m | 7.7% | ≈22.6% | Needs confirmation |
| Hobbs Lane | near Longhope · Gloucestershire | — | sustained | 453 m | 50 m | 11.0% | 20.2% | Good |
| Hodshill | near Midford · Somerset | — | sustained | 1854 m | 118 m | 6.4% | ≈26.9% | Good |
| Hogg Lane | near North Grimston · North Yorkshire | — | stepped | 446 m | 35 m | 7.9% | 20.2% | Needs confirmation |
| Holbrook | near Central Lydbrook · Gloucestershire | — | sustained | 1361 m | 121 m | 8.9% | 21.0% | Good |
| Holcombe Down Road | near Dawlish · Devon | — | sustained | 2776 m | 182 m | 6.6% | 23.8% | High |
| Holden Lane | near Silsden | — | stepped | 2222 m | 160 m | 7.2% | 20.2% | Good |
| Holdscroft Lane | near Fishpond Bottom · Dorset | — | sustained | 1188 m | 109 m | 9.2% | 22.8% | Good |
| Hollins | near Wensley · North Yorkshire | — | sustained | 1560 m | 117 m | 7.5% | 20.2% | High |
| Hollinsclough Rake | near Hollinsclough · Staffordshire | — | stepped | 1749 m | 117 m | 6.7% | 21.0% | High |
| Hollow Combe to Ember Combe° | near Hollow Combe · Somerset | — | sustained | 4133 m | 279 m | 6.7% | 17.5% | High |
| Holme House Lane | near Goose Eye | — | sustained | 1380 m | 84 m | 6.1% | 20.2% | Good |
| Holme Lane | near Slaithwaite | — | sustained | 1987 m | 160 m | 8.1% | 24.8% | High |
| Holmfirth Road | near Waterside | — | sustained | 5501 m | 318 m | 5.8% | 8.7% | High |
| Holne Turn to Wellsfoot Island° | near Holne Turn · Devon | — | sustained | 1564 m | 109 m | 6.9% | ≈21.1% | Good |
| Holroyd Mill Lane | near Micklethwaite | — | sustained | 408 m | 44 m | 10.8% | 22.5% | High |
| Honister Pass | near Seatoller · Cumbria | — | sustained | 2178 m | 228 m | 10.4% | 24.5% | High |
| Honiton to Carpenter's Hill° | near Honiton · Devon | — | stepped | 3861 m | 182 m | 4.7% | 24.9% | Good |
| Hoo Meavy to Clearbrook° | near Hoo Meavy · Devon | — | stepped | 1334 m | 67 m | 5.1% | 26.4% | High |
| Hooke to Rampisham Hill° | near Hooke · Dorset | — | stepped | 1446 m | 73 m | 5.1% | 22.0% | High |
| Hookway Hill | near Oareford · Somerset | — | stepped | 1765 m | 139 m | 7.9% | ≈28.4% | Good |
| Horderley to Woolston° | near Horderley · Shropshire | — | sustained | 1130 m | 108 m | 9.6% | 24.8% | High |
| Horn Lane | near New Mill | — | sustained | 2806 m | 190 m | 6.8% | 20.3% | Good |
| Horner's Green to Castling's Heath° | near Groton · Suffolk | — | stepped | 1792 m | 29 m | 1.6% | 22.0% | High |
| Horsebridge to Milton Abbot° | near Horsebridge · Devon | — | sustained | 2302 m | 135 m | 5.9% | 20.4% | High |
| Horsehold Lane | near Hebden Bridge | — | sustained | 1809 m | 175 m | 9.7% | 26.7% | Good |
| Horseshoe Pass | near Llidiart Annie · Clwyd | Nat HC 19712, National HC2, Wikipedia3, 100 Climbs1 | sustained | 4543 m | 276 m | 6.1% | ≈14.4% | Good |
| Horslea | near Joy's Green · Gloucestershire | — | sustained | 1786 m | 139 m | 7.8% | 24.9% | Needs confirmation |
| Hostle Park Road | near Ilfracombe · Devon | — | sustained | 298 m | 42 m | 14.2% | 20.2% | High |
| Hoxton Road | near Torquay · Devon | — | sustained | 448 m | 45 m | 10.0% | 20.3% | High |
| Hudson Lane | near Ruspidge · Gloucestershire | — | sustained | 438 m | 47 m | 10.8% | 20.6% | High |
| Huff Clough to Crutchenber Fell° | near Huff Clough · Lancashire | — | stepped | 2224 m | 162 m | 7.3% | 20.1% | Good |
| Hunton Hill | near Hunton · Kent | — | stepped | 1331 m | 93 m | 7.0% | ≈28.3% | Good |
| Huntshaw to Woodtown° | near Huntshaw · Devon | — | sustained | 2112 m | 99 m | 4.7% | 23.6% | Needs confirmation |
| Hyner Bottom to Hennock° | near Teign Village · Devon | — | sustained | 1262 m | 142 m | 11.2% | 23.4% | High |
| Ibberton to Ibberton Hill° | near Ibberton · Dorset | — | stepped | 2130 m | 147 m | 6.9% | ≈26.0% | Good |
| Icknield Street | near Weatheroak Hill · Worcestershire | — | stepped | 1330 m | 57 m | 4.3% | ≈21.3% | Good |
| Inchbrook Hill | near Nailsworth · Gloucestershire | — | sustained | 409 m | 58 m | 14.1% | 21.1% | Good |
| Ings to High Knott° | near Ings · Cumbria | — | sustained | 1046 m | 97 m | 9.3% | 21.4% | High |
| Issac's Tea Trail | near Alston · Cumbria | — | stepped | 901 m | 72 m | 8.0% | 20.3% | Needs confirmation |
| Jack Hill | near Allithwaite · Cumbria | — | sustained | 390 m | 42 m | 10.8% | 21.6% | High |
| Jinkin Avenue | near Lipson · Devon | — | sustained | 290 m | 33 m | 11.2% | 20.0% | Needs confirmation |
| Jinny Lane | near Roughlee · Lancashire | — | stepped | 1715 m | 114 m | 6.7% | 21.4% | High |
| Jubilee Road | near Newton Abbot · Devon | — | sustained | 237 m | 30 m | 12.5% | 22.8% | High |
| Jumble Hole Road | near Charlestown | — | sustained | 791 m | 70 m | 8.9% | ≈24.6% | Needs confirmation |
| Kellaton to Bickerton° | near Kellaton · Devon | — | sustained | 760 m | 86 m | 11.3% | 21.2% | High |
| Kellow Hill | near Polperro · Cornwall | — | stepped | 1583 m | 109 m | 6.9% | 22.9% | Needs confirmation |
| Kershaw Road | near Walsden | — | sustained | 201 m | 26 m | 13.1% | 22.7% | High |
| Kerswell to North Hill° | near Kerswell · Devon | — | stepped | 3306 m | 143 m | 4.3% | 25.5% | Needs confirmation |
| Kestle to Manaccan° | near Kestle · Cornwall | — | stepped | 1298 m | 49 m | 3.8% | 21.8% | Needs confirmation |
| Kidley Hill to Carey° | near Carey · Herefordshire | — | sustained | 937 m | 67 m | 7.2% | ≈21.4% | Good |
| Kilkenny Lane | near Padley Bottom · Somerset | — | stinger | 1288 m | 41 m | 3.1% | 21.4% | High |
| Killicks Hill | near Fortuneswell · Dorset | — | sustained | 435 m | 45 m | 10.2% | 20.6% | High |
| Kiln Lane | near Stokenham · Devon | — | sustained | 903 m | 65 m | 7.2% | 21.0% | High |
| Kinders Lane | near Boarshurst | — | sustained | 586 m | 57 m | 9.7% | 21.4% | High |
| King's Hill | near Ystrad Mynach · Gwent | — | stepped | 1033 m | 78 m | 7.6% | 20.4% | Good |
| Kingscott to High Bullen° | near Kingscott · Devon | — | stepped | 3137 m | 129 m | 4.1% | ≈20.6% | Good |
| Kirkstone Pass | near Caudale · Cumbria | — | sustained | 3458 m | 265 m | 7.7% | ≈17.7% | Good |
| Knott Hill Lane | near Delph | — | sustained | 1134 m | 115 m | 10.1% | ≈20.5% | Good |
| Lamledra Hill | near Gorran Haven · Cornwall | — | sustained | 533 m | 59 m | 11.0% | ≈24.7% | Good |
| Lamplands Lane | near Grosmont · North Yorkshire | — | sustained | 2464 m | 157 m | 6.4% | 22.0% | High |
| Landkey Town to Whiddon° | near Landkey Town · Devon | — | sustained | 829 m | 73 m | 8.8% | ≈26.4% | Good |
| Lane And Dowry Road | near Slaithwaite | — | sustained | 2347 m | 157 m | 6.7% | 22.6% | High |
| Lane Ends Lane | near Hebden Bridge | — | sustained | 1666 m | 148 m | 8.9% | 20.1% | High |
| Lane near Abercych° | near Abercych · Dyfed | — | stepped | 684 m | 73 m | 10.6% | ≈26.3% | Good |
| Lane near Allaleigh° | near Allaleigh · Devon | — | sustained | 2311 m | 139 m | 6.0% | 22.8% | Needs confirmation |
| Lane near Almondbury Common° | near Almondbury Common | — | stepped | 286 m | 23 m | 8.1% | 20.0% | Good |
| Lane near Archenfield° | near Y Gelli Gandryll · Powys | — | stepped | 3260 m | 189 m | 5.8% | ≈28.8% | Good |
| Lane near Ashford° | near Ashford · Devon | — | stepped | 608 m | 52 m | 8.5% | 20.8% | High |
| Lane near Bargod° | near Bargod · Gwent | — | stepped | 412 m | 37 m | 8.9% | 25.0% | Good |
| Lane near Baysdale° | near Baysdale · North Yorkshire | — | sustained | 428 m | 56 m | 13.0% | 21.5% | High |
| Lane near Belingick Hill° | near Burlawn · Cornwall | — | sustained | 3563 m | 121 m | 3.4% | 22.9% | Needs confirmation |
| Lane near Berry Down° | near Berry Down · Cornwall | — | sustained | 1526 m | 77 m | 5.1% | 26.1% | High |
| Lane near Betws-y-coed | near Betws-y-Coed · Clwyd | tag: 20% (2026) | sustained | 1263 m | 162 m | 12.8% | ≈21.6% | Good |
| Lane near Bickham° | near Bickham · Devon | — | stepped | 2179 m | 104 m | 4.8% | 22.9% | High |
| Lane near Bickleigh Vale° | near Bickleigh · Devon | — | sustained | 904 m | 88 m | 9.7% | 22.4% | Needs confirmation |
| Lane near Blackawton° | near Blackawton · Devon | — | stepped | 1981 m | 46 m | 2.3% | 21.6% | Good |
| Lane near Blackdown Hill° | near Brownston · Devon | — | stepped | 1795 m | 55 m | 3.1% | 25.6% | Good |
| Lane near Blaen-y-Glyn | near Bannau Brycheiniog · Powys | tag: 20% (2026) | sustained | 1515 m | 180 m | 11.8% | ≈19.7% | Good |
| Lane near Blaenllechau | — | stepped | 452 m | 30 m | 6.6% | ≈28.8% | Needs confirmation | |
| Lane near Bodinnick° | near Fowey · Cornwall | — | stepped | 993 m | 74 m | 7.5% | 22.2% | Needs confirmation |
| Lane near Boscastle° | near Boscastle · Cornwall | — | sustained | 1599 m | 143 m | 8.9% | 22.0% | Needs confirmation |
| Lane near Bransdale° | near Bransdale · North Yorkshire | — | sustained | 848 m | 65 m | 7.7% | 20.3% | High |
| Lane near Bridford° | near Bridford · Devon | — | stepped | 2263 m | 62 m | 2.8% | 20.6% | Good |
| Lane near Bridford° | near Bridford · Devon | — | sustained | 2904 m | 116 m | 4.0% | 20.6% | Good |
| Lane near Buckfast° | near Buckfastleigh · Devon | — | sustained | 580 m | 36 m | 6.3% | 21.6% | High |
| Lane near Buckland° | near Buckland · Devon | — | sustained | 731 m | 90 m | 12.3% | 28.3% | Needs confirmation |
| Lane near Buckland Monachorum° | near Buckland Monachorum · Devon | — | sustained | 960 m | 96 m | 10.0% | ≈27.0% | Good |
| Lane near Bucknell° | near Bucknell · Shropshire | — | stepped | 1041 m | 75 m | 7.2% | 24.3% | Good |
| Lane near Butterdon Hill° | near Dunsford · Devon | — | stepped | 3440 m | 228 m | 6.6% | 21.5% | Good |
| Lane near Calderside° | near Hebden Bridge | — | sustained | 431 m | 41 m | 9.5% | 21.0% | Good |
| Lane near Carkeel° | near Carkeel · Cornwall | — | sustained | 328 m | 36 m | 10.9% | 20.1% | Good |
| Lane near Carnach° | near Carnach · Na h-Eileanan an Iar | — | stepped | 529 m | 32 m | 6.0% | 27.0% | Needs confirmation |
| Lane near Castle Idris° | near Bettws-y-Crwyn · Shropshire | — | sustained | 2113 m | 149 m | 7.1% | ≈25.0% | Needs confirmation |
| Lane near Ceunant | near Ceunant · Powys | — | sustained | 991 m | 86 m | 8.7% | ≈26.4% | Good |
| Lane near Challaborough° | near Challaborough · Devon | — | sustained | 960 m | 46 m | 4.8% | 20.8% | Needs confirmation |
| Lane near Chapel Hill° | near Braunton · Devon | — | stepped | 373 m | 32 m | 8.5% | 20.7% | Needs confirmation |
| Lane near Chulmleigh° | near Chulmleigh · Devon | — | stepped | 667 m | 55 m | 8.3% | ≈27.1% | Needs confirmation |
| Lane near Churchbridge° | near Churchbridge · Cornwall | — | sustained | 1119 m | 112 m | 10.0% | ≈21.2% | Good |
| Lane near Clee St Margaret° | near Clee St Margaret · Shropshire | — | sustained | 1066 m | 99 m | 9.3% | ≈23.2% | Good |
| Lane near Cockayne° | near Cockayne · North Yorkshire | — | sustained | 276 m | 36 m | 13.2% | ≈21.0% | Good |
| Lane near Cole's Cross° | near Cole's Cross · Devon | — | stepped | 1221 m | 64 m | 5.3% | 20.5% | Good |
| Lane near Colton° | near Spark Bridge · Cumbria | — | sustained | 685 m | 58 m | 8.5% | 21.7% | Needs confirmation |
| Lane near Combe° | near Salcombe · Devon | — | stepped | 1141 m | 64 m | 5.6% | 26.2% | Needs confirmation |
| Lane near Cook's Gully° | near Ubley · Somerset | — | sustained | 935 m | 70 m | 7.5% | 20.4% | Needs confirmation |
| Lane near Coombe° | near Coombe · Devon | — | sustained | 2868 m | 166 m | 5.8% | 22.3% | High |
| Lane near Cotleigh° | near Cotleigh · Devon | — | stepped | 1401 m | 65 m | 4.6% | 26.3% | High |
| Lane near Coverack° | near Coverack · Cornwall | — | sustained | 532 m | 31 m | 5.8% | 20.5% | Needs confirmation |
| Lane near Crai° | near Crai · Powys | — | stepped | 1072 m | 53 m | 5.0% | 20.3% | Good |
| Lane near Cranham° | near Cranham · Gloucestershire | — | sustained | 1014 m | 61 m | 6.0% | 21.1% | High |
| Lane near Creag Garten° | near Cullachie · Highland | — | stepped | 961 m | 54 m | 5.6% | 22.0% | High |
| Lane near Cwm° | near Cwm · Powys | — | sustained | 2426 m | 122 m | 5.0% | 20.6% | Good |
| Lane near Cwmisfael° | near Llanddarog · Dyfed | — | sustained | 1240 m | 52 m | 4.2% | 21.7% | Good |
| Lane near Cwrt | near Cwrt · Gwynedd | tag: 20% (2026) | sustained | 1015 m | 94 m | 9.2% | 24.4% | High |
| Lane near Dean Prior° | near Dean Prior · Devon | — | sustained | 930 m | 72 m | 7.7% | ≈20.6% | Good |
| Lane near Diptford° | near Diptford · Devon | — | sustained | 1147 m | 82 m | 7.2% | 20.9% | Needs confirmation |
| Lane near Dolanog° | near Dolanog · Powys | — | stepped | 3249 m | 42 m | 1.3% | 20.5% | Good |
| Lane near Dolgellau° | near Dolgellau · Gwynedd | — | sustained | 234 m | 35 m | 15.1% | 20.3% | High |
| Lane near Dunsford° | near Dunsford · Devon | — | sustained | 1721 m | 178 m | 10.4% | ≈19.0% | Good |
| Lane near Eastcombe° | near Eastcombe · Gloucestershire | — | sustained | 621 m | 80 m | 13.0% | ≈27.5% | Good |
| Lane near Easthope° | near Easthope · Shropshire | — | sustained | 437 m | 41 m | 9.3% | 20.2% | High |
| Lane near Edge Hill° | near Edgehill · Warwickshire | — | stepped | 627 m | 54 m | 8.5% | 22.9% | Good |
| Lane near Esgair Llwyn-gwyn° | near Cwm Brithgwm · Powys | — | sustained | 730 m | 83 m | 11.3% | 20.6% | High |
| Lane near Exe Valley° | near Exe Valley · Devon | — | sustained | 1315 m | 127 m | 9.6% | 21.7% | High |
| Lane near Exe Valley° | near Exe Valley · Devon | — | sustained | 3622 m | 201 m | 5.6% | 22.3% | Needs confirmation |
| Lane near Folly Gate° | near Folly Gate · Devon | — | stepped | 1603 m | 84 m | 5.2% | 22.4% | Needs confirmation |
| Lane near Foula Geo° | near Easter Quarff · Shetland Islands | — | stepped | 358 m | 30 m | 8.4% | 20.8% | High |
| Lane near Fovant° | near Fovant · Wiltshire | — | stepped | 1301 m | 94 m | 7.2% | 22.2% | High |
| Lane near Frogwell° | near Callington · Cornwall | — | sustained | 1076 m | 52 m | 4.9% | 21.0% | Good |
| Lane near Fron° | near Fron · Powys | — | sustained | 492 m | 89 m | 18.1% | ≈29.3% | Good |
| Lane near Furshamdown Bottom° | near Furshamdown Bottom · Devon | — | sustained | 767 m | 64 m | 8.4% | 20.1% | High |
| Lane near Fyfett° | near Fyfett · Somerset | — | stepped | 927 m | 63 m | 6.8% | 21.9% | High |
| Lane near Garndolbenmaen° | near Garndolbenmaen · Gwynedd | — | stepped | 722 m | 65 m | 9.0% | 20.6% | High |
| Lane near Garth Row° | near Garth Row · Cumbria | — | sustained | 912 m | 68 m | 7.4% | 20.4% | Good |
| Lane near Garthbeibio° | near Foel · Powys | — | stepped | 322 m | 34 m | 10.6% | ≈23.5% | Needs confirmation |
| Lane near Gilfach° | near Glan-y-nant · Gwent | — | stepped | 352 m | 28 m | 7.8% | 20.7% | High |
| Lane near Gilsland° | near Gilsland · Cumbria | — | stepped | 682 m | 43 m | 6.4% | 21.5% | High |
| Lane near Glascoed° | near Glascoed · Powys | — | stepped | 1360 m | 101 m | 7.5% | 25.2% | High |
| Lane near Glyn Ceiriog° | near Glyn Ceiriog · Clwyd | — | stepped | 522 m | 60 m | 11.4% | ≈27.2% | Good |
| Lane near Glyn Ceiriog° | near Glyn Ceiriog · Clwyd | — | sustained | 1051 m | 87 m | 8.3% | ≈27.2% | Needs confirmation |
| Lane near Glyn Saer° | near Glyn Saer · Dyfed | — | stepped | 7043 m | 150 m | 2.1% | 11.7% | Needs confirmation |
| Lane near Goat Island° | near Goat Island · Cumbria | — | stepped | 1782 m | 57 m | 3.2% | 20.1% | High |
| Lane near Goveton° | near Kingsbridge · Devon | — | sustained | 947 m | 73 m | 7.7% | 22.0% | Good |
| Lane near Great Torrington° | near Great Torrington · Devon | — | sustained | 1336 m | 61 m | 4.6% | 20.0% | High |
| Lane near Great Weeke° | near Chagford · Devon | — | sustained | 2056 m | 114 m | 5.5% | ≈25.4% | Good |
| Lane near Gweek° | near Gweek · Cornwall | — | sustained | 456 m | 64 m | 14.1% | 26.2% | Needs confirmation |
| Lane near Gwenter° | near Gwenter · Cornwall | — | stepped | 313 m | 29 m | 9.1% | 22.8% | Needs confirmation |
| Lane near Harbourneford° | near Harbourneford · Devon | — | sustained | 1167 m | 99 m | 8.5% | 22.3% | Needs confirmation |
| Lane near Harbourneford° | near Harbourneford · Devon | — | sustained | 1216 m | 81 m | 6.6% | 23.0% | High |
| Lane near Hawnby° | near Hawnby · North Yorkshire | — | stepped | 5320 m | 210 m | 4.0% | 20.8% | High |
| Lane near Helestone Park° | near Helestone Park · Devon | — | sustained | 2351 m | 112 m | 4.8% | 25.2% | High |
| Lane near Helland° | near Helland · Cornwall | — | sustained | 1238 m | 99 m | 8.0% | 22.3% | High |
| Lane near Herodsfoot° | near Herodsfoot · Cornwall | — | sustained | 1669 m | 113 m | 6.8% | 24.8% | Good |
| Lane near Herodsfoot° | near Herodsfoot · Cornwall | — | stepped | 1480 m | 75 m | 5.0% | 23.5% | High |
| Lane near Higher Batson° | near Higher Batson · Devon | — | stepped | 683 m | 59 m | 8.6% | 21.6% | Good |
| Lane near Hillside° | near Hillside · Angus | — | stepped | 3683 m | 69 m | 1.9% | 20.5% | Good |
| Lane near Hittisleigh° | near Hittisleigh · Devon | — | stepped | 1319 m | 85 m | 6.4% | 26.8% | Good |
| Lane near Holbeton° | near Holbeton · Devon | — | sustained | 1036 m | 60 m | 5.8% | 20.6% | Needs confirmation |
| Lane near Horsley Hope° | near Horsley Hope · County Durham | — | sustained | 1235 m | 109 m | 8.8% | 22.7% | Needs confirmation |
| Lane near Huddleston Hill° | near Rusland Valley · Cumbria | — | sustained | 850 m | 59 m | 6.9% | 24.5% | Good |
| Lane near Huntshaw° | near Huntshaw · Devon | — | stepped | 773 m | 45 m | 5.8% | ≈22.5% | Good |
| Lane near Ivelet° | near Ivelet · North Yorkshire | — | sustained | 950 m | 97 m | 10.3% | 20.6% | Good |
| Lane near Kenwyn° | near Truro · Cornwall | — | sustained | 854 m | 77 m | 9.0% | 21.9% | Good |
| Lane near Kilgwrrwg Common° | near Kilgwrrwg · Gwent | — | stepped | 1472 m | 117 m | 7.9% | ≈27.5% | Good |
| Lane near Killington° | near Killington · Cumbria | — | sustained | 1278 m | 86 m | 6.7% | 25.9% | Good |
| Lane near Kilpeck° | near Kilpeck · Herefordshire | — | stepped | 824 m | 51 m | 6.2% | 23.8% | Good |
| Lane near Kings Nympton° | near Kings Nympton · Devon | — | sustained | 1529 m | 91 m | 5.9% | 21.4% | High |
| Lane near Kingscott° | near St Giles in the Wood · Devon | — | stepped | 1275 m | 69 m | 5.4% | 22.4% | Needs confirmation |
| Lane near Kingskerswell° | near Kingskerswell · Devon | — | sustained | 249 m | 29 m | 11.6% | 27.6% | Good |
| Lane near Kingston° | near Kingston · Devon | — | stepped | 1989 m | 91 m | 4.6% | ≈22.1% | Needs confirmation |
| Lane near Langcliffe° | near Langcliffe · North Yorkshire | — | sustained | 800 m | 114 m | 14.3% | 23.7% | High |
| Lane near Lanreath° | near Lanreath · Cornwall | — | stepped | 1321 m | 76 m | 5.8% | ≈20.3% | Good |
| Lane near Lanteglos Highway° | near Fowey · Cornwall | — | sustained | 1244 m | 86 m | 6.9% | 23.1% | Needs confirmation |
| Lane near Leighton | near Pentre · Powys | tag: 20% (2026) | sustained | 646 m | 70 m | 10.9% | ≈22.8% | Good |
| Lane near Lesnewth° | near Lesnewth · Cornwall | — | stepped | 2706 m | 164 m | 6.1% | 20.1% | High |
| Lane near Life Rock° | near Life Rock · Devon | — | sustained | 425 m | 51 m | 12.1% | 21.5% | High |
| Lane near Little Black Hill° | near Michaelchurch Escley · Herefordshire | — | sustained | 1776 m | 146 m | 8.2% | 24.5% | Good |
| Lane near Littleham° | near Littleham · Devon | — | stepped | 681 m | 33 m | 4.8% | ≈20.8% | Good |
| Lane near Llanarmon Mynydd Mawr | near Llanrhaeadr-ym-Mochnant · Powys | tag: 20% (2026) | sustained | 762 m | 85 m | 11.1% | ≈26.8% | Good |
| Lane near Llanddeusant° | near Llanddeusant · Dyfed | — | sustained | 499 m | 66 m | 13.2% | ≈27.4% | Good |
| Lane near Llanedi° | near Llanedi · Dyfed | — | stepped | 1275 m | 66 m | 5.2% | 20.3% | High |
| Lane near Llanfair Talhaearn° | near Llanfair Talhaiarn · Clwyd | — | sustained | 1627 m | 141 m | 8.6% | 20.4% | High |
| Lane near Llanfihangel-y-Creuddyn° | near Llanfihangel-y-Creuddyn · Dyfed | — | sustained | 553 m | 70 m | 12.6% | ≈21.5% | Good |
| Lane near Llangadfan° | near Llangadfan · Powys | — | sustained | 546 m | 56 m | 10.2% | ≈27.3% | Good |
| Lane near Llanglydwen° | near Llanglydwen · Dyfed | — | sustained | 1839 m | 96 m | 5.2% | 20.3% | High |
| Lane near Llanveynoe° | near Llanveynoe · Herefordshire | — | sustained | 756 m | 85 m | 11.2% | 25.9% | High |
| Lane near Llanybri° | near Llanybri · Dyfed | — | sustained | 879 m | 93 m | 10.5% | ≈26.4% | Good |
| Lane near Llanystumdwy° | near Llanystumdwy · Gwynedd | — | stepped | 556 m | 36 m | 6.4% | ≈27.0% | Good |
| Lane near Llywel° | near Trecastle · Powys | — | stepped | 1500 m | 59 m | 3.9% | ≈20.8% | Good |
| Lane near Loddiswell° | near Loddiswell · Devon | — | sustained | 1027 m | 77 m | 7.5% | ≈21.9% | Needs confirmation |
| Lane near Loddiswell° | near Loddiswell · Devon | — | sustained | 526 m | 50 m | 9.4% | ≈20.9% | Good |
| Lane near Long Island° | near Long Island · Devon | — | stepped | 1008 m | 64 m | 6.3% | 21.6% | High |
| Lane near Lowgill° | near Lowgill · Cumbria | — | stepped | 715 m | 45 m | 6.3% | 20.8% | Good |
| Lane near Loxbeare° | near Loxbeare · Devon | — | sustained | 2560 m | 96 m | 3.8% | 21.8% | Needs confirmation |
| Lane near Lustleigh° | near Lustleigh · Devon | — | sustained | 1313 m | 104 m | 7.9% | 21.2% | High |
| Lane near Lustleigh° | near Lustleigh · Devon | — | sustained | 2767 m | 167 m | 6.0% | ≈29.7% | Good |
| Lane near Luxulyan Valley° | near St Blazey · Cornwall | — | stepped | 844 m | 51 m | 6.1% | 20.4% | Good |
| Lane near Luxulyan Valley° | near St Blazey · Cornwall | — | sustained | 2277 m | 113 m | 4.9% | 22.2% | Good |
| Lane near Maen-Offeren° | near Blaenau Ffestiniog · Gwynedd | — | sustained | 225 m | 29 m | 13.1% | 25.3% | High |
| Lane near Maenan° | near Maenan · Clwyd | — | sustained | 1027 m | 138 m | 13.5% | ≈27.5% | Good |
| Lane near Mamhead Bottom° | near Mamhead Bottom · Devon | — | sustained | 2171 m | 115 m | 5.3% | 26.9% | Needs confirmation |
| Lane near Manely° | near Golant · Cornwall | — | stepped | 1720 m | 95 m | 5.5% | ≈23.5% | Needs confirmation |
| Lane near Mansley Combe° | near Mansley Combe · Somerset | — | sustained | 1889 m | 68 m | 3.6% | 23.0% | Good |
| Lane near Merther° | near Merther · Cornwall | — | sustained | 708 m | 41 m | 5.7% | 20.4% | High |
| Lane near Middle Coombe° | near Ludwell · Wiltshire | — | stepped | 542 m | 54 m | 10.0% | ≈22.4% | Good |
| Lane near Middle Crackington° | near Middle Crackington · Cornwall | — | sustained | 967 m | 94 m | 9.7% | ≈22.3% | Needs confirmation |
| Lane near Middlewood° | near Bathpool · Cornwall | — | sustained | 656 m | 93 m | 14.2% | ≈32.6% | Needs confirmation |
| Lane near Millendreath° | near Millendreath · Cornwall | — | sustained | 211 m | 41 m | 19.6% | ≈28.6% | Good |
| Lane near Miskin° | near Miskin · Mid Glamorgan | — | stepped | 752 m | 70 m | 9.3% | 22.0% | High |
| Lane near Miskin° | near Mountain Ash · Mid Glamorgan | — | sustained | 315 m | 47 m | 14.9% | 21.0% | High |
| Lane near Molland° | near Molland · Devon | — | stepped | 1741 m | 97 m | 5.6% | ≈26.9% | Needs confirmation |
| Lane near Moorswater° | near Liskeard · Cornwall | — | stepped | 1259 m | 63 m | 5.0% | 23.2% | Good |
| Lane near Moorswater° | near Liskeard · Cornwall | — | sustained | 3126 m | 157 m | 5.0% | 23.7% | Good |
| Lane near Moretonhampstead° | near Moretonhampstead · Devon | — | stepped | 1299 m | 89 m | 6.9% | ≈21.3% | Good |
| Lane near Morwenstow° | near Woodford · Cornwall | — | sustained | 624 m | 44 m | 7.1% | 21.0% | High |
| Lane near Mount Pleasant° | near Gateshead | — | sustained | 231 m | 24 m | 10.2% | 21.1% | High |
| Lane near Murchington° | near Chagford · Devon | — | sustained | 715 m | 55 m | 7.7% | 23.1% | Needs confirmation |
| Lane near Newbiggin° | near Lupton · Cumbria | — | stepped | 1683 m | 103 m | 6.1% | 20.1% | Needs confirmation |
| Lane near Newfoundland Point° | near Dartmouth · Devon | — | sustained | 704 m | 93 m | 13.1% | ≈27.3% | Needs confirmation |
| Lane near Newfoundland Point° | near Dartmouth · Devon | — | sustained | 1283 m | 105 m | 8.2% | 21.5% | Good |
| Lane near Newhaven° | near Parkham · Devon | — | stepped | 1145 m | 67 m | 5.8% | 22.0% | Good |
| Lane near Newton° | near Newton · Cornwall | — | sustained | 1178 m | 101 m | 8.5% | 23.1% | Good |
| Lane near North Stoke° | near North Stoke · Somerset | — | sustained | 1370 m | 106 m | 7.8% | 21.5% | High |
| Lane near Oxford Down° | near Filleigh · Devon | — | stepped | 660 m | 20 m | 3.0% | 20.2% | Good |
| Lane near Penpoll° | near Penpoll · Cornwall | — | stepped | 1580 m | 78 m | 4.9% | ≈27.6% | Good |
| Lane near Philham° | near Philham · Devon | — | stepped | 340 m | 31 m | 9.1% | 22.7% | Good |
| Lane near Pidland Bottom° | near Pidland Bottom · Devon | — | stepped | 919 m | 59 m | 6.4% | 20.9% | High |
| Lane near Pillaton° | near Pillaton · Cornwall | — | sustained | 1639 m | 97 m | 5.9% | ≈27.3% | Good |
| Lane near Pont-Tyweli° | near Llandysul · Dyfed | — | sustained | 1898 m | 104 m | 5.5% | ≈23.9% | Good |
| Lane near Port Navas° | near Port Navas · Cornwall | — | sustained | 2976 m | 92 m | 3.1% | ≈23.3% | Good |
| Lane near Price Town° | near Price Town · Mid Glamorgan | — | sustained | 432 m | 46 m | 10.6% | 22.9% | High |
| Lane near Probus° | near Probus · Cornwall | — | sustained | 2950 m | 82 m | 2.8% | ≈28.1% | Good |
| Lane near Pyleigh° | near Pyleigh · Somerset | — | sustained | 693 m | 64 m | 9.2% | 23.9% | Good |
| Lane near Rabb Clough° | near Rabb Clough · Cheshire | — | sustained | 798 m | 87 m | 10.9% | 23.0% | High |
| Lane near Redpost° | near Redpost · Cornwall | — | sustained | 1637 m | 117 m | 7.1% | 26.5% | Good |
| Lane near Rhyd-Meirionnydd | near Llangorwen · Dyfed | tag: 25% | sustained | 4090 m | 116 m | 2.8% | 13.9% | Good |
| Lane near Roseland Peninsula° | near Roseland Peninsula · Cornwall | — | stepped | 924 m | 55 m | 6.0% | ≈22.0% | Good |
| Lane near Roskruge Beacon° | near St Keverne · Cornwall | — | stepped | 1075 m | 50 m | 4.6% | 24.8% | High |
| Lane near Sampford Spiney° | near Sampford Spiney · Devon | — | sustained | 637 m | 69 m | 10.9% | ≈22.9% | Good |
| Lane near Sandplace° | near Looe · Cornwall | — | stepped | 2159 m | 95 m | 4.4% | ≈21.1% | Needs confirmation |
| Lane near Shaugh Prior° | near Shaugh Prior · Devon | — | sustained | 1147 m | 94 m | 8.2% | ≈29.0% | Good |
| Lane near Sheepwash° | near Sheepwash · Devon | — | stepped | 646 m | 37 m | 5.8% | 20.3% | Good |
| Lane near Sheldon° | near Sheldon · Devon | — | stepped | 1668 m | 92 m | 5.5% | 20.4% | Needs confirmation |
| Lane near South Brent° | near South Brent · Devon | — | sustained | 800 m | 84 m | 10.5% | 23.9% | Needs confirmation |
| Lane near South Pool° | near South Pool · Devon | — | sustained | 913 m | 77 m | 8.4% | 20.1% | Good |
| Lane near St Jidgey° | near St Jidgey · Cornwall | — | sustained | 2552 m | 77 m | 3.0% | 21.7% | Needs confirmation |
| Lane near St Michael Caerhays° | near St Michael Caerhays · Cornwall | — | stepped | 1604 m | 77 m | 4.8% | 25.3% | High |
| Lane near St Neot° | near St Neot · Cornwall | — | stepped | 2063 m | 107 m | 5.2% | 26.0% | Good |
| Lane near St Neot° | near Mount · Cornwall | — | stepped | 2218 m | 60 m | 2.7% | 21.6% | Good |
| Lane near St Neot° | near St Neot · Cornwall | — | sustained | 995 m | 87 m | 8.8% | 20.5% | High |
| Lane near St Neot° | near St Neot · Cornwall | — | sustained | 1182 m | 79 m | 6.7% | 20.5% | High |
| Lane near St Pinnock° | near Trevelmond · Cornwall | — | sustained | 1123 m | 83 m | 7.4% | ≈20.6% | Good |
| Lane near St Pinnock° | near Trevelmond · Cornwall | — | sustained | 902 m | 72 m | 8.0% | ≈20.6% | Good |
| Lane near Staffield° | near Staffield · Cumbria | — | stepped | 880 m | 70 m | 7.9% | 28.6% | High |
| Lane near Stanleytown° | near Pontygwaith · Mid Glamorgan | — | sustained | 164 m | 27 m | 16.1% | 28.4% | High |
| Lane near Steep Marsh° | near Steep Marsh · Hampshire | — | stepped | 866 m | 55 m | 6.4% | 22.4% | Good |
| Lane near Stepaside° | near Stepaside · Powys | — | sustained | 1727 m | 112 m | 6.5% | ≈26.3% | Good |
| Lane near Stokeinteignhead° | near Stokeinteignhead · Devon | — | sustained | 506 m | 51 m | 10.2% | 23.9% | Good |
| Lane near Sugarloaf° | near Wetton · Staffordshire | — | sustained | 754 m | 78 m | 10.4% | 22.0% | Good |
| Lane near Sutcombe° | near Sutcombe · Devon | — | stepped | 2348 m | 51 m | 2.2% | 21.1% | Good |
| Lane near Templeton° | near Templeton · Devon | — | stepped | 1708 m | 111 m | 6.5% | 21.6% | High |
| Lane near Thursden Valley° | near Thursden Valley · Lancashire | — | sustained | 815 m | 60 m | 7.4% | 22.2% | High |
| Lane near Tinhay° | near Tinhay · Devon | — | sustained | 2702 m | 135 m | 5.0% | 20.1% | Needs confirmation |
| Lane near Tinhay° | near Tinhay · Devon | — | sustained | 737 m | 86 m | 11.6% | 20.1% | Needs confirmation |
| Lane near Toadsmoor Valley° | near Toadsmoor Valley · Gloucestershire | — | stepped | 374 m | 35 m | 9.4% | 23.8% | Good |
| Lane near Tom's Rock° | near Tom's Rock · Cornwall | — | sustained | 1497 m | 75 m | 5.0% | 25.6% | High |
| Lane near Ton Pentre° | near Rhondda · Mid Glamorgan | — | sustained | 314 m | 40 m | 12.6% | ≈28.5% | Good |
| Lane near Trealaw° | near Tonypandy · Mid Glamorgan | — | stepped | 253 m | 25 m | 9.9% | ≈24.5% | Good |
| Lane near Trealaw° | near Tonypandy · Mid Glamorgan | — | stepped | 409 m | 35 m | 8.6% | 23.8% | Needs confirmation |
| Lane near Treborough° | near Treborough · Somerset | — | sustained | 2102 m | 125 m | 6.0% | 21.1% | Needs confirmation |
| Lane near Trebudannon° | near Trebudannon · Cornwall | — | stepped | 3938 m | 43 m | 1.1% | 23.6% | Needs confirmation |
| Lane near Trelawne° | near Looe · Cornwall | — | stepped | 1937 m | 130 m | 6.7% | 24.9% | Needs confirmation |
| Lane near Trenance° | near Trenance · Cornwall | — | sustained | 361 m | 37 m | 10.2% | 22.1% | Good |
| Lane near Turkdean° | near Turkdean · Gloucestershire | — | sustained | 1375 m | 68 m | 4.9% | 21.2% | Needs confirmation |
| Lane near Twitchen° | near Twitchen · Devon | — | stepped | 991 m | 69 m | 7.0% | ≈23.3% | Needs confirmation |
| Lane near Ty'n-y-groes° | near Ty'n-y-groes · Clwyd | — | stepped | 957 m | 48 m | 5.0% | ≈26.2% | Good |
| Lane near Tythecott° | near Tythecott · Devon | — | stepped | 2727 m | 69 m | 2.5% | 21.7% | Needs confirmation |
| Lane near Tythecott° | near Tythecott · Devon | — | stepped | 996 m | 64 m | 6.4% | 20.9% | High |
| Lane near Umberleigh° | near Umberleigh · Devon | — | stepped | 1513 m | 63 m | 4.1% | 20.2% | Good |
| Lane near Upcott° | near Upcott · Devon | — | stepped | 746 m | 35 m | 4.8% | ≈21.2% | Good |
| Lane near Upottery° | near Upottery · Devon | — | stepped | 1229 m | 82 m | 6.6% | ≈20.9% | Good |
| Lane near Vellanoweth° | near Vellanoweth · Cornwall | — | sustained | 1829 m | 83 m | 4.5% | 24.6% | Good |
| Lane near Venn° | near Aveton Gifford · Devon | — | sustained | 609 m | 73 m | 11.9% | 20.9% | Good |
| Lane near Walreddon° | near Walreddon · Devon | — | stepped | 2594 m | 119 m | 4.6% | 20.3% | Needs confirmation |
| Lane near Warcombe° | near Loddiswell · Devon | — | sustained | 1529 m | 116 m | 7.6% | ≈21.6% | Good |
| Lane near Wernffrwd° | near Wernffrwd · West Glamorgan | — | sustained | 1264 m | 81 m | 6.4% | 22.0% | High |
| Lane near West Alvington° | near Kingsbridge · Devon | — | sustained | 1135 m | 83 m | 7.3% | 25.3% | Good |
| Lane near Westcott° | near Westcott · Devon | — | sustained | 973 m | 112 m | 11.5% | 20.6% | Good |
| Lane near Whitesands Bay° | near Whitesands Bay · Dyfed | — | sustained | 610 m | 48 m | 7.9% | 22.1% | Good |
| Lane near Willand° | near Willand · Somerset | — | stepped | 1096 m | 37 m | 3.4% | 22.4% | High |
| Lane near Wincombe° | near Donhead St Mary · Wiltshire | — | stepped | 614 m | 52 m | 8.5% | 20.9% | Needs confirmation |
| Lane near Wing° | near Wing · Rutland | — | sustained | 385 m | 32 m | 8.4% | 20.0% | Good |
| Lane near Winsley Hill° | near Ainthorpe · North Yorkshire | — | stepped | 593 m | 41 m | 6.8% | 21.0% | High |
| Lane near Winster° | near Winster · Cumbria | — | sustained | 1074 m | 75 m | 6.9% | 21.5% | High |
| Lane near Winswell° | near Winswell · Devon | — | stepped | 2417 m | 66 m | 2.7% | 23.6% | High |
| Lane near Witheridge° | near Witheridge · Devon | — | stepped | 591 m | 51 m | 8.6% | 23.1% | Needs confirmation |
| Lane near Withiel° | near Withiel · Cornwall | — | sustained | 663 m | 75 m | 11.4% | 22.8% | High |
| Lane near Woodland Head° | near Woodland Head · Devon | — | stepped | 1711 m | 103 m | 6.0% | 26.5% | High |
| Lane near Woodland Head° | near Woodland Head · Devon | — | sustained | 1096 m | 80 m | 7.3% | 25.6% | High |
| Lane near Worley Hill° | near Chudleigh · Devon | — | stepped | 988 m | 77 m | 7.8% | 22.6% | High |
| Lane near Wyke° | near Wyke · Shropshire | — | stepped | 328 m | 26 m | 8.0% | 20.8% | High |
| Lane near Yarnscombe° | near Yarnscombe · Devon | — | sustained | 3565 m | 143 m | 4.0% | 21.9% | Needs confirmation |
| Lane near Ystradfellte° | near Ystradfellte · Powys | — | stepped | 2317 m | 79 m | 3.4% | 21.0% | High |
| Langaller Hill | near Brushford · Somerset | — | stepped | 1468 m | 77 m | 5.2% | 22.7% | High |
| Langley to Toot Hill° | near Langley · Cheshire | — | sustained | 2696 m | 185 m | 6.9% | 25.0% | Needs confirmation |
| Lanjeth to Watch Hill° | near Lanjeth · Cornwall | — | sustained | 2110 m | 134 m | 6.3% | 21.6% | Good |
| Largs Road | near Largs · North Ayrshire | — | stepped | 3661 m | 174 m | 4.8% | ≈15.4% | Needs confirmation |
| Larrick to Newtown° | near Larrick · Cornwall | — | stepped | 1287 m | 76 m | 5.9% | 22.4% | Good |
| Latchley to Chilsworthy° | near Latchley · Cornwall | — | sustained | 1475 m | 120 m | 8.1% | 22.5% | Needs confirmation |
| Laurieston Road | near Gatehouse of Fleet · Dumfries and Galloway | — | sustained | 5100 m | 177 m | 3.5% | ≈19.6% | Good |
| Lawbrook Lane | near Hoe · Surrey | — | sustained | 3825 m | 98 m | 2.6% | 21.9% | Needs confirmation |
| Lawnt to Tir Mostyn° | near Dinbych · Clwyd | — | sustained | 9367 m | 331 m | 3.5% | 17.9% | High |
| Leadgate Bank | near Riding Cleugh · Northumberland | — | stepped | 1674 m | 138 m | 8.3% | 24.6% | High |
| Leashaw Road | near Whatstandwell · Derbyshire | — | stepped | 1279 m | 77 m | 6.0% | 23.5% | Needs confirmation |
| Lee Lane | near Stump Cross | — | sustained | 898 m | 133 m | 14.8% | ≈22.4% | Needs confirmation |
| Lees Road | near Porchester · Nottinghamshire | — | stepped | 404 m | 30 m | 7.5% | 21.4% | High |
| Lemington Dean to Horseley Hill° | near Lemington Dean · Scottish Borders | — | sustained | 3686 m | 169 m | 4.6% | 13.2% | Good |
| Lenches to Waterside° | near Colne · Lancashire | — | sustained | 544 m | 54 m | 10.0% | 22.5% | High |
| Lerryn to Manely° | near Lerryn · Cornwall | — | sustained | 1342 m | 95 m | 7.1% | 22.6% | Good |
| Lesnewth to Trewannion Down° | near Lesnewth · Cornwall | — | sustained | 2054 m | 139 m | 6.8% | 25.9% | Good |
| Levencorroch Hill to Levencorroch° | near Levencorroch · North Ayrshire | — | stepped | 817 m | 55 m | 6.8% | 20.6% | Good |
| Lever's Hill | near Silver Street · Gloucestershire | — | sustained | 1757 m | 181 m | 10.3% | 27.1% | Good |
| Lewes Golf Club | near Lewes · East Sussex | — | sustained | 680 m | 75 m | 11.0% | ≈26.1% | Good |
| Lewis Street | near Abersychan · Gwent | — | stepped | 1483 m | 87 m | 5.9% | 23.2% | High |
| Lewsley Lane | near Rock · Devon | — | stepped | 780 m | 77 m | 9.9% | 25.8% | High |
| Ley Hill Road | near Ley Hill · Buckinghamshire | — | stepped | 414 m | 33 m | 7.9% | 20.8% | High |
| Limber Hill | near Carr End · North Yorkshire | — | stepped | 1013 m | 66 m | 6.5% | 30.1% | Good |
| Ling Hill | near Lady Edith's · North Yorkshire | — | stepped | 410 m | 26 m | 6.4% | 20.7% | High |
| Link Lane | near Burrington · Somerset | — | stepped | 1315 m | 106 m | 8.0% | 21.0% | Needs confirmation |
| Little Fryup Dale to Loose Howe° | near Little Fryup Dale · North Yorkshire | — | stepped | 4080 m | 203 m | 5.0% | 20.2% | High |
| Little Quantock Lane | near Triscombe · Somerset | — | sustained | 1404 m | 56 m | 4.0% | 20.1% | Needs confirmation |
| Little Scone to Galdrings° | near Machrihanish · Argyll and Bute | — | sustained | 1942 m | 116 m | 6.0% | 21.0% | High |
| Little Toms | near East Butterleigh · Devon | — | stepped | 1004 m | 59 m | 5.8% | 20.4% | High |
| Littlebeck to Eskdaleside° | near Littlebeck · North Yorkshire | — | stepped | 2137 m | 111 m | 5.2% | 27.9% | Good |
| Littlemoor Road | near Broadbottom | — | sustained | 1192 m | 115 m | 9.6% | 22.3% | Needs confirmation |
| Livingstone Road | near Bolton Woods | — | sustained | 459 m | 57 m | 12.5% | 20.6% | High |
| Llanarth to Synod Inn / Post Mawr° | near Llanarth · Dyfed | — | stepped | 3396 m | 110 m | 3.2% | 13.0% | High |
| Llanbedr Dyffryn Clwyd to Gyrn° | near Llanbedr-Dyffryn-Clwyd · Clwyd | — | sustained | 2370 m | 149 m | 6.3% | 18.1% | High |
| Llanberis Pass | near Gwastadnant · Gwynedd | Wikipedia3, Another 1005 | sustained | 1716 m | 86 m | 5.0% | 11.3% | High |
| Llancowrid to Goetre Hill° | near Sarn · Powys | — | stepped | 2355 m | 100 m | 4.2% | ≈26.4% | Good |
| Llandderfel to Carnedd Wen° | near Llandderfel · Gwynedd | — | stepped | 2906 m | 221 m | 7.6% | ≈26.4% | Good |
| Llandecwyn to Bryn Bwbach° | near Llandecwyn · Gwynedd | — | sustained | 1271 m | 86 m | 6.8% | ≈27.8% | Good |
| Llandeilo Road | near Garnant · Dyfed | — | stepped | 2628 m | 129 m | 4.9% | ≈29.8% | Good |
| Llanellen to Cefn y Galchen° | near Llanellen · Gwent | — | sustained | 5964 m | 452 m | 7.6% | ≈21.5% | Good |
| Llanellen to Coed y Prior | — | sustained | 950 m | 138 m | 14.5% | ≈30.4% | Good | |
| Llanfach Road | near Abercarn · Gwent | — | sustained | 1737 m | 187 m | 10.8% | ≈20.9% | Good |
| Llanfair Waterdine to Lloyney° | near Llanfair Waterdine · Shropshire | — | stepped | 1387 m | 68 m | 4.9% | 23.8% | Good |
| Llanfihangel-y-Creuddyn to Pant-y-crug | near Llanfihangel-y-Creuddyn · Dyfed | — | stepped | 1494 m | 96 m | 6.4% | 25.4% | Good |
| Llanfynydd to Pant-y-Cerig° | near Llanfynydd · Dyfed | — | stepped | 2692 m | 150 m | 5.6% | ≈21.3% | Good |
| Llangadog to Pentir-bach | near Llangadog · Dyfed | — | stepped | 2117 m | 69 m | 3.2% | ≈26.4% | Good |
| Llangollen to Blaen-Bache Dingle | — | sustained | 2665 m | 279 m | 10.5% | ≈25.0% | Good | |
| Llangrove Road | near Whitchurch · Herefordshire | — | sustained | 898 m | 75 m | 8.3% | 23.8% | High |
| Llanguicke Road | near Pontardawe · West Glamorgan | — | sustained | 1172 m | 156 m | 13.3% | ≈28.7% | Good |
| Llangynidr to Cwm Cleisfer° | near Llangynidr · Powys | — | sustained | 2044 m | 149 m | 7.3% | ≈27.2% | Good |
| Llanilid to Ruthin° | near Ruthin · South Glamorgan | — | stepped | 1616 m | 31 m | 1.9% | ≈12.0% | Needs confirmation |
| Llanwonno Road | near Hopkinstown · Mid Glamorgan | — | sustained | 659 m | 70 m | 10.7% | 20.2% | Good |
| Llanybydder to Mynydd Llanybyther° | near Llanybydder · Dyfed | — | sustained | 6003 m | 286 m | 4.8% | 15.2% | Good |
| Llanymynech to Llanymynech Hill° | near Llanymynech · Powys | — | stepped | 463 m | 35 m | 7.6% | ≈20.5% | Good |
| Llawr-y-glyn to Glyntrefnant° | near Llawr-y-glyn · Powys | — | sustained | 1033 m | 131 m | 12.6% | ≈26.7% | Good |
| Lloyd Avenue | near Shiphay · Devon | — | stepped | 409 m | 34 m | 8.2% | 21.2% | High |
| Llwynmawr to Bedwlwyn° | near Llwynmawr · Clwyd | — | sustained | 1808 m | 159 m | 8.8% | 26.1% | Needs confirmation |
| Locker Lane | near Allithwaite · Cumbria | — | stepped | 1217 m | 71 m | 5.8% | 26.3% | Good |
| Lockyers Hill | near Fraby's Bottom · Kent | — | stepped | 778 m | 68 m | 8.7% | 23.7% | Good |
| Loddiswell to Ashford° | near Loddiswell · Devon | — | sustained | 1004 m | 68 m | 6.8% | ≈24.8% | Needs confirmation |
| Lofthouse to Middlesmoor° | near Lofthouse · North Yorkshire | — | sustained | 1507 m | 130 m | 8.6% | 23.4% | Good |
| Lombards Wynd | near Richmond · North Yorkshire | — | sustained | 265 m | 37 m | 14.0% | 24.8% | Good |
| Lon Bribwll | near Llanbedrog · Gwynedd | — | stepped | 635 m | 40 m | 6.3% | ≈27.2% | Needs confirmation |
| Lon Golff | near Machroes · Gwynedd | — | stepped | 907 m | 59 m | 6.5% | 23.7% | Good |
| Longcroft to Braeface° | near Longcroft · Falkirk | — | sustained | 1259 m | 73 m | 5.8% | ≈24.0% | Good |
| Longfield Road | near Todmorden | — | sustained | 444 m | 40 m | 9.0% | 24.5% | Needs confirmation |
| Longley Lane | near Sowerby Bridge | — | sustained | 1542 m | 112 m | 7.3% | 22.9% | Good |
| Longshaw Ford Road | near Johnson Fold | — | sustained | 930 m | 73 m | 7.8% | 20.2% | High |
| Lonkley Terrace | near Allendale Town · Northumberland | — | stepped | 3709 m | 134 m | 3.6% | 24.7% | Needs confirmation |
| Lostwithiel to Sweetshouse° | near Lostwithiel · Cornwall | — | sustained | 1895 m | 157 m | 8.3% | 21.1% | Needs confirmation |
| Love Lane | near Dolgellau · Gwynedd | — | sustained | 380 m | 36 m | 9.5% | 20.7% | Good |
| Love's Lane | near Morcombelake · Dorset | — | sustained | 458 m | 52 m | 11.4% | 20.4% | High |
| Low Fremington to High Fremington° | near Grinton · North Yorkshire | — | stepped | 412 m | 33 m | 8.1% | 24.8% | Good |
| Low Lane | near Draughton · North Yorkshire | — | sustained | 545 m | 48 m | 8.9% | ≈21.2% | Good |
| Low Westwood Lane | near Linthwaite | — | sustained | 909 m | 108 m | 11.9% | ≈22.3% | Needs confirmation |
| Lower Audley Road | near Torquay · Devon | — | sustained | 233 m | 25 m | 10.8% | 20.8% | High |
| Lower Bayble to Pabail Uarach° | near Lower Bayble · Na h-Eileanan an Iar | — | stepped | 277 m | 31 m | 11.4% | 21.6% | High |
| Lower Harper's Road | near Abersychan · Gwent | — | stepped | 1502 m | 114 m | 7.6% | ≈26.1% | Good |
| Lower Lydbrook to Carterspiece° | near Lower Lydbrook · Gloucestershire | — | sustained | 3648 m | 194 m | 5.3% | ≈21.7% | Good |
| Lower Lye to Upper Lye° | near Lower Lye · Herefordshire | — | sustained | 1959 m | 79 m | 4.0% | 24.5% | Good |
| Lower Shepton to Stoney Stoke° | near Shepton Montague · Somerset | — | stepped | 2983 m | 47 m | 1.6% | ≈21.3% | Needs confirmation |
| Lower Stoney Road | near Abersychan · Gwent | — | stepped | 623 m | 62 m | 10.0% | ≈26.1% | Good |
| Lower Strode to Silkhay° | near Lower Strode · Dorset | — | sustained | 612 m | 39 m | 6.3% | 20.4% | High |
| Lowfield Lane | near Kentmere · Cumbria | — | sustained | 704 m | 63 m | 9.0% | 23.6% | Needs confirmation |
| Luckett to Kit Hill° | near Luckett · Cornwall | — | sustained | 3568 m | 288 m | 8.1% | 25.3% | High |
| Luppitt to Hartridge° | near Luppitt · Devon | — | sustained | 978 m | 87 m | 8.9% | 25.4% | High |
| Luscombe Hill | near Dawlish · Devon | — | sustained | 3288 m | 195 m | 5.9% | 22.7% | Good |
| Lustleigh to Hingston Down° | near Lustleigh · Devon | — | stepped | 6059 m | 246 m | 4.1% | 24.3% | Good |
| Lydbury North to Oakeley Mynd° | near Lydbury North · Shropshire | — | sustained | 1211 m | 117 m | 9.7% | 24.7% | High |
| Lynbridge Road | near Lynton · Devon | — | sustained | 1987 m | 202 m | 10.2% | ≈23.9% | Needs confirmation |
| Lôn Nant Stigallt | near Pwllheli · Gwynedd | — | sustained | 917 m | 60 m | 6.5% | ≈27.7% | Good |
| Macclesfield Road | near Whaley Bridge · Derbyshire | — | sustained | 1534 m | 108 m | 7.0% | 20.8% | Needs confirmation |
| Maesyffynnon Terrace | near Tonypandy · Mid Glamorgan | — | stepped | 364 m | 38 m | 10.5% | 21.8% | High |
| Main Road | near Crockham Hill · Kent | — | sustained | 794 m | 35 m | 4.5% | ≈11.5% | Good |
| Mainstone to Bryn Hill° | near Mainstone · Shropshire | — | sustained | 2046 m | 66 m | 3.2% | 30.8% | Needs confirmation |
| Maker Lane | near Millbrook · Cornwall | — | sustained | 963 m | 93 m | 9.7% | 23.6% | Good |
| Malinscommon Lane | near Wirksworth · Derbyshire | — | sustained | 1676 m | 139 m | 8.3% | 26.8% | High |
| Manaccan to Roskruge Beacon° | near Manaccan · Cornwall | — | stepped | 2722 m | 79 m | 2.9% | 22.2% | Good |
| Manafon to Tŷ-mawr Hill° | near Manafon · Powys | — | sustained | 703 m | 75 m | 10.6% | 24.8% | Good |
| Mannacott Lane | near Trentishoe · Devon | — | sustained | 1412 m | 195 m | 13.8% | ≈27.0% | Good |
| Manor Farm Lane | near Goleigh Bottom · Hampshire | — | sustained | 1453 m | 66 m | 4.5% | 21.2% | Needs confirmation |
| Mantley Lane | near Grains Bar | — | sustained | 711 m | 45 m | 6.4% | 22.6% | High |
| Margery Lane | near Clearwell · Gloucestershire | — | sustained | 740 m | 63 m | 8.5% | 24.2% | High |
| Marle Hill | near Chalford · Gloucestershire | — | sustained | 536 m | 81 m | 15.1% | 26.1% | Good |
| Marsden Lane | near Lingards Wood | — | sustained | 2062 m | 147 m | 7.1% | 24.7% | Good |
| Marsett Lane | near Marsett · North Yorkshire | — | stepped | 3408 m | 154 m | 4.5% | 21.1% | High |
| Marshbrook to Shooter's Knoll° | near Marshbrook · Shropshire | — | stepped | 1756 m | 84 m | 4.8% | 28.4% | Needs confirmation |
| Marshclose Hill | near Hawkridge · Somerset | — | stepped | 1240 m | 95 m | 7.7% | 24.2% | Good |
| Marton to Beacon Ring° | near Marton · Shropshire | — | sustained | 3682 m | 276 m | 7.5% | ≈29.5% | Good |
| Marystow to Stowford° | near Marystow · Devon | — | stepped | 3002 m | 101 m | 3.4% | 21.9% | High |
| Maudlin Drive | near Teignmouth · Devon | — | sustained | 1498 m | 129 m | 8.6% | 22.8% | Good |
| Maybole Bypass | near Maybole · South Ayrshire | — | stepped | 483 m | 42 m | 8.7% | 27.5% | High |
| McBain's Hill | near Strath Dores · Highland | — | sustained | 3156 m | 176 m | 5.6% | ≈17.6% | Good |
| Meal Bank to Patton Bridge° | near Meal Bank · Cumbria | — | sustained | 2509 m | 120 m | 4.8% | 22.6% | Good |
| Meg Lane | near Milnsbridge | — | stepped | 566 m | 54 m | 9.5% | 21.8% | High |
| Melin-y-coed to Pant-y-maes° | near Melin-y-coed · Clwyd | — | sustained | 2452 m | 262 m | 10.7% | ≈30.3% | Needs confirmation |
| Mennock Pass | near Dunin Cleuch · Dumfries and Galloway | — | sustained | 7079 m | 261 m | 3.7% | 11.9% | High |
| Merrymeet to Pengover Green° | near Merrymeet · Cornwall | — | sustained | 2318 m | 77 m | 3.3% | 21.8% | Good |
| Middle Barn Hill | near Worlaby · Lincolnshire | — | sustained | 1105 m | 73 m | 6.6% | 22.3% | Good |
| Middle Combe to Hawkmoor Park° | near Bovey Tracey · Devon | — | sustained | 3352 m | 121 m | 3.6% | 22.4% | Good |
| Middle Combe to Hennock° | near Bovey Tracey · Devon | — | sustained | 1867 m | 114 m | 6.1% | 22.8% | High |
| Middle Crackington to St Gennys° | near Middle Crackington · Cornwall | — | sustained | 658 m | 91 m | 13.9% | 25.6% | Good |
| Middle Duntisbourne to Duntisbourne Leer° | near Middle Duntisbourne · Gloucestershire | — | sustained | 1539 m | 42 m | 2.7% | ≈20.8% | Good |
| Milford to Edistone° | near Milford · Devon | — | stepped | 1648 m | 74 m | 4.5% | 23.1% | Good |
| Milken Lane | near Littlemoor · Derbyshire | — | stepped | 2081 m | 122 m | 5.9% | 24.9% | Good |
| Mill Dingle to Pant-glas° | near Mill Dingle · Shropshire | — | stepped | 1849 m | 48 m | 2.6% | 24.3% | High |
| Mill End to Rotten Row° | near Mill End · Buckinghamshire | — | stepped | 2280 m | 102 m | 4.5% | 23.3% | Good |
| Mill Rock to Borough Valley° | near Lee · Devon | — | sustained | 1310 m | 120 m | 9.2% | ≈26.2% | Needs confirmation |
| Mill Steep | near Twitchen · Devon | — | stepped | 852 m | 58 m | 6.8% | ≈23.3% | Needs confirmation |
| Milladon Lane | near Bake Bottoms · Cornwall | — | sustained | 335 m | 53 m | 15.7% | ≈24.8% | Needs confirmation |
| Millcombe to Blackawton° | near Blackawton · Devon | — | stepped | 1026 m | 76 m | 7.4% | 28.2% | Needs confirmation |
| Millhayes to Stockland Hill° | near Millhayes · Devon | — | sustained | 1321 m | 89 m | 6.7% | 20.3% | High |
| Millook Mouth to Bridwill Point° | near Millook Mouth · Cornwall | — | sustained | 708 m | 96 m | 13.5% | 28.0% | High |
| Millook Mouth to Raven's Beak° | near Millook Mouth · Cornwall | — | sustained | 767 m | 103 m | 13.4% | ≈23.2% | Good |
| Milltir Gerrig | near Llangynog · Powys | Wikipedia3 | sustained | 5940 m | 325 m | 5.5% | ≈11.3% | Good |
| Milltown to No Man's Land° | near Lostwithiel · Cornwall | — | stepped | 2692 m | 120 m | 4.4% | 21.6% | Needs confirmation |
| Millway Lane | near Milldale · Staffordshire | — | sustained | 1108 m | 107 m | 9.7% | 20.9% | High |
| Minffordd to Cwm Rhwyddfor° | near Minffordd · Gwynedd | Wikipedia3, Warren app4 | sustained | 2505 m | 148 m | 5.9% | 12.0% | High |
| Miry Lane | near Netherthong | — | stepped | 872 m | 58 m | 6.7% | ≈26.8% | Good |
| Moel Cwm yr Eglwys to Bwlch Oerddrws° | near Cwm Cerist · Gwynedd | Wikipedia3 | sustained | 2227 m | 191 m | 8.6% | 16.5% | High |
| Moel Emwnt to Moel Unben° | near Llanfair Talhaiarn · Clwyd | — | sustained | 2977 m | 123 m | 4.1% | 23.2% | Good |
| Moles Cross | near Compton · Devon | — | sustained | 762 m | 49 m | 6.4% | 21.8% | Good |
| Moles Lane | near Edginswell · Devon | — | stepped | 2599 m | 102 m | 3.9% | 20.8% | High |
| Money Acre Road | near Farway · Devon | — | sustained | 2110 m | 158 m | 7.5% | ≈26.6% | Good |
| Monks Hill | near Kewstoke · Somerset | — | sustained | 505 m | 62 m | 12.3% | ≈24.8% | Good |
| Moore Street | near Gateshead | — | sustained | 799 m | 69 m | 8.6% | 20.8% | High |
| Moorhaven Village to Wrangaton Bottom° | near Moorhaven Village · Devon | — | sustained | 1338 m | 131 m | 9.8% | 20.3% | Good |
| Moorswater to Liskeard° | near Liskeard · Cornwall | — | sustained | 768 m | 70 m | 9.1% | 20.7% | Needs confirmation |
| More Hall Lane | near Wharncliffe Side | — | sustained | 1752 m | 133 m | 7.6% | 21.0% | Needs confirmation |
| Moretonhampstead to Butterdon Hill° | near Moretonhampstead · Devon | — | sustained | 771 m | 94 m | 12.2% | 20.4% | Good |
| Moretonhampstead to Butterdon Hill° | near Moretonhampstead · Devon | — | sustained | 3342 m | 141 m | 4.2% | 26.7% | Good |
| Moretonhampstead to Butterdon Hill° | near Moretonhampstead · Devon | — | sustained | 1227 m | 78 m | 6.3% | 21.6% | Needs confirmation |
| Moretonhampstead to Butterdon Hill° | near Moretonhampstead · Devon | — | stepped | 1953 m | 92 m | 4.7% | 20.3% | Good |
| Morleigh Road | near Harbertonford · Devon | — | stepped | 1194 m | 64 m | 5.3% | ≈20.3% | Needs confirmation |
| Mote Road | near Ivy Hatch · Kent | — | stepped | 1133 m | 65 m | 5.7% | 20.1% | Needs confirmation |
| Mounson Hill | near Woodland Head · Devon | — | stepped | 495 m | 50 m | 10.0% | 21.7% | High |
| Mount Boone | near Dartmouth · Devon | — | sustained | 1046 m | 103 m | 9.9% | 23.0% | Needs confirmation |
| Mount Pleasant Terrace | near Mountain Ash · Mid Glamorgan | — | sustained | 724 m | 62 m | 8.5% | 21.6% | High |
| Mount Road | near Risca · Gwent | — | stepped | 825 m | 95 m | 11.5% | ≈26.5% | Good |
| Mountain Road | near Port Talbot · West Glamorgan | — | stepped | 514 m | 53 m | 10.4% | ≈31.4% | Good |
| Mountain Road | near Risca · Gwent | — | sustained | 3884 m | 274 m | 7.0% | ≈26.5% | Needs confirmation |
| Mow Lane | near Congleton · Cheshire | — | sustained | 2152 m | 113 m | 5.3% | 20.2% | High |
| Mowing's Lane | near Ulverston · Cumbria | — | stepped | 320 m | 25 m | 7.9% | 20.7% | High |
| Muchlarnick to Pelynt° | near Muchlarnick · Cornwall | — | stepped | 3591 m | 144 m | 4.0% | 26.0% | Good |
| Muker to Kisdon Bottom° | near Muker · North Yorkshire | — | stepped | 1629 m | 86 m | 5.3% | 22.4% | High |
| Musbury to Edge Hill° | near Musbury · Devon | — | sustained | 1367 m | 129 m | 9.4% | 23.7% | Needs confirmation |
| Mutton Street | near Marshalsea · Dorset | — | stepped | 1851 m | 95 m | 5.1% | 20.1% | High |
| Nadder Bottom | near Nadderwater · Devon | — | sustained | 2587 m | 172 m | 6.7% | 26.3% | Needs confirmation |
| Nant-y-Rhiw to Moel Trefriw° | near Nant-y-Rhiw · Clwyd | — | sustained | 4096 m | 279 m | 6.8% | ≈25.6% | Good |
| Nateby to Fells End Bottom° | near Nateby · Cumbria | — | sustained | 4269 m | 309 m | 7.2% | 20.0% | High |
| Netherton Lane | near Combe Martin · Devon | — | sustained | 417 m | 50 m | 12.1% | 20.9% | Needs confirmation |
| New Earth Street | near Mossley | — | sustained | 339 m | 49 m | 14.6% | 22.1% | High |
| New Mill Bank | near Bolsterstone | — | sustained | 1115 m | 144 m | 12.9% | 22.0% | Needs confirmation |
| New Mills to Ceunant y Garys | — | sustained | 1951 m | 201 m | 10.3% | ≈22.8% | Needs confirmation | |
| New Road | near Rocher Bottom | — | sustained | 1887 m | 131 m | 6.9% | 27.6% | Good |
| New Town to Church Hill° | near New Town · Herefordshire | — | stepped | 4443 m | 174 m | 3.9% | 27.2% | Good |
| Newbiggin to Conny Tammy Currack° | near Askrigg · North Yorkshire | — | sustained | 2814 m | 262 m | 9.3% | 22.1% | High |
| Newbridge to Higher Keason° | near Callington · Cornwall | — | stepped | 4748 m | 124 m | 2.6% | 21.2% | Good |
| Newbuilding's Hill | near Upham · Devon | — | sustained | 858 m | 81 m | 9.4% | 22.9% | Good |
| Newcastle to Spoad Hill° | near Newcastle · Shropshire | — | sustained | 1765 m | 189 m | 10.7% | 30.5% | Needs confirmation |
| Newgale Hill | near Newgale · Dyfed | Warren app4 | sustained | 836 m | 83 m | 9.9% | 21.7% | High |
| Newland Road | near Upper Redbrook · Gwent | — | sustained | 993 m | 102 m | 10.3% | 24.5% | High |
| Newlands Pass | near Buttermere · Cumbria | — | sustained | 1000 m | 124 m | 12.4% | 21.6% | High |
| Newlands Pass | near Lll Gill · Cumbria | — | stepped | 1167 m | 95 m | 8.1% | 23.6% | High |
| Newmills to Higher Truscott° | near Newmills · Cornwall | — | sustained | 779 m | 76 m | 9.7% | 21.5% | Good |
| Newmills to Higher Truscott° | near Newmills · Cornwall | — | stepped | 1544 m | 86 m | 5.5% | 22.8% | Good |
| Newmills to Tregadillett° | near Tregadillett · Cornwall | — | stepped | 1128 m | 84 m | 7.5% | ≈21.4% | Needs confirmation |
| Newstead Rise | near Caterham · Surrey | — | stepped | 462 m | 32 m | 6.9% | 21.1% | High |
| Newton of Falkland to Purin Hill° | near Newton of Falkland · Fife | — | sustained | 2338 m | 232 m | 9.9% | 15.0% | Good |
| Newtown Knott to Broad Oak° | near Newbiggin · Cumbria | — | stepped | 1684 m | 64 m | 3.8% | 20.8% | Good |
| Noddle Hill to Scawton° | near Nettle Dale · North Yorkshire | — | stepped | 1564 m | 87 m | 5.6% | 21.8% | High |
| Nomansland to Uppincott° | near Nomansland · Devon | — | stepped | 1434 m | 59 m | 4.1% | ≈30.3% | Good |
| Norris Green to Newton° | near Norris Green · Cornwall | — | sustained | 295 m | 45 m | 15.4% | 20.3% | Good |
| North Bird's Hill to Monksilver° | near Monksilver · Somerset | — | sustained | 596 m | 48 m | 8.0% | 23.6% | Good |
| North Buckland Hill | near Middle Winsham · Devon | — | stepped | 2240 m | 92 m | 4.1% | ≈23.2% | Needs confirmation |
| North Malvern Road | near Great Malvern · Worcestershire | — | sustained | 1860 m | 122 m | 6.6% | 21.1% | High |
| North Molton to North Molton Ridge° | near North Molton · Devon | — | sustained | 5123 m | 278 m | 5.4% | ≈15.1% | Good |
| North Radworthy to Span Head° | near North Radworthy · Devon | — | sustained | 6324 m | 255 m | 4.0% | 19.4% | Good |
| Northgate | near Honley | — | sustained | 841 m | 63 m | 7.5% | 20.9% | Good |
| Northway to Pyleigh° | near Fitzhead · Somerset | — | stepped | 1882 m | 82 m | 4.4% | 24.1% | High |
| Nought Moor Road | near Pateley Bridge · North Yorkshire | — | sustained | 2334 m | 211 m | 9.0% | 21.0% | High |
| Noverton Lane | near Prestbury · Gloucestershire | — | sustained | 1147 m | 79 m | 6.9% | 20.2% | Needs confirmation |
| Nower Road | near Kilmington · Devon | — | sustained | 2110 m | 132 m | 6.3% | ≈24.4% | Good |
| Nutgrove Lane | near Chew Magna · Somerset | — | sustained | 691 m | 86 m | 12.5% | 24.0% | Good |
| Olchon Valley | near Olchon Valley · Herefordshire | — | sustained | 2096 m | 152 m | 7.2% | 20.0% | Good |
| Old Charlton Road | near Dover · Kent | — | sustained | 1408 m | 109 m | 7.7% | 26.6% | High |
| Old Dailly to Green Hill° | near Old Dailly · South Ayrshire | — | sustained | 4684 m | 179 m | 3.8% | 17.1% | Good |
| Old Hill to Blakeney Hill° | near Blakeney · Gloucestershire | — | sustained | 254 m | 40 m | 15.9% | 20.8% | High |
| Old Lane | near Scapegoat Hill | — | sustained | 523 m | 63 m | 12.0% | 24.6% | High |
| Old Largs Road | near Greenock · Inverclyde | — | sustained | 3251 m | 193 m | 5.9% | 16.3% | High |
| Old Military Road | near Coire Goibhre · Perth and Kinross | — | stepped | 296 m | 24 m | 8.0% | 22.4% | Needs confirmation |
| Old Paul Hill | near Newlyn · Cornwall | — | sustained | 347 m | 41 m | 11.9% | ≈20.0% | Needs confirmation |
| Old Pool Bank | near Pool Bank | — | sustained | 1287 m | 109 m | 8.4% | 22.4% | Good |
| Old Rake | near Torver · Cumbria | — | sustained | 1748 m | 127 m | 7.3% | 22.7% | High |
| Old Town Hill | near Ilsington · Devon | — | stepped | 974 m | 90 m | 9.3% | 22.5% | Good |
| Old Walls Hill | near Bishopsteignton · Devon | — | sustained | 1480 m | 167 m | 11.3% | ≈22.0% | Needs confirmation |
| Old Wyche Road | near Lower Wyche · Worcestershire | — | sustained | 788 m | 91 m | 11.5% | 24.8% | High |
| Onen to Pen-y-lan | — | sustained | 1489 m | 111 m | 7.5% | ≈27.8% | Needs confirmation | |
| Ordley Lane | near Stanton · Staffordshire | — | sustained | 714 m | 65 m | 9.2% | 25.8% | Good |
| Ostlings Lane | near Bathford · Somerset | — | stepped | 657 m | 45 m | 6.9% | 20.2% | High |
| Oughtershaw Road | near Oughtershaw · North Yorkshire | — | sustained | 2699 m | 231 m | 8.6% | 22.0% | High |
| Ovenden Wood Road | near Ovenden Wood | — | stepped | 1163 m | 102 m | 8.7% | 23.2% | High |
| Overs Dingle to The Bog° | near Overs Dingle · Shropshire | — | sustained | 3825 m | 177 m | 4.6% | 20.4% | High |
| Oxford Down to East Buckland° | near Heddon Bottom · Devon | — | sustained | 1520 m | 88 m | 5.8% | 26.9% | Good |
| Padarn Crescent | sign: 16% (2024) | stepped | 221 m | 11 m | 4.8% | 19.3% | High | |
| Paddons Lane | near Teignmouth · Devon | — | stepped | 518 m | 43 m | 8.3% | ≈21.6% | Needs confirmation |
| Pandy to Pen y Gyrn° | near Llanuwchllyn · Gwynedd | — | sustained | 1197 m | 107 m | 8.9% | 21.8% | Needs confirmation |
| Pannier Lane | near Carbis Bay · Cornwall | — | stepped | 601 m | 53 m | 8.7% | 32.0% | High |
| Panorama Walk | — | stepped | 1298 m | 89 m | 6.9% | ≈28.6% | Good | |
| Panorama Walk | near Pateley Bridge · North Yorkshire | — | sustained | 838 m | 75 m | 8.9% | ≈20.7% | Good |
| Panorama Walk | near Llangollen · Clwyd | — | sustained | 2851 m | 165 m | 5.8% | ≈28.7% | Good |
| Pant Du | — | sustained | 820 m | 101 m | 12.4% | ≈26.9% | Good | |
| Pant Glâs to Bryn-y-gôg | near Pant Glâs · Gwynedd | — | stepped | 1675 m | 103 m | 6.2% | 20.3% | High |
| Paradise | near Broseley · Shropshire | — | sustained | 237 m | 30 m | 12.8% | 21.2% | Good |
| Parbrook to Stickleball Hill° | near Parbrook · Somerset | — | stepped | 1900 m | 94 m | 4.9% | 21.2% | High |
| Parc Road | near Graig Trewyddfa · West Glamorgan | — | sustained | 413 m | 43 m | 10.3% | 20.8% | High |
| Parc-y-rhôs to Mynydd Pencarreg° | near Lampeter · Dyfed | — | sustained | 5901 m | 276 m | 4.7% | ≈19.0% | Needs confirmation |
| Park Mill Lane | near Chulmleigh · Devon | — | stepped | 827 m | 70 m | 8.5% | ≈28.7% | Good |
| Park Road | near Ferndale · Mid Glamorgan | — | sustained | 899 m | 76 m | 8.5% | 25.8% | High |
| Park Street | near Clydach Vale · Mid Glamorgan | — | stepped | 996 m | 76 m | 7.6% | 23.0% | High |
| Parkinson's Lane | near Cobby Syke · North Yorkshire | — | sustained | 318 m | 33 m | 10.4% | 20.9% | High |
| Partrishow Hill to Partrishow° | near Cwm Gwent · Powys | — | sustained | 2447 m | 154 m | 6.3% | ≈27.8% | Good |
| Pattard Water to Exmansworthy° | near Hartland · Devon | — | stepped | 1231 m | 67 m | 5.4% | ≈22.6% | Good |
| Pea Royd Lane | near Stocksbridge | Tour of Britain7, National HC2 | sustained | 442 m | 68 m | 15.3% | ≈19.2% | Needs confirmation |
| Peasland Road | near Watcombe · Devon | — | stepped | 591 m | 41 m | 6.9% | 20.2% | High |
| Pecks Road | near Rushton Bank · Staffordshire | — | sustained | 1736 m | 76 m | 4.4% | 21.1% | High |
| Peggy's Bank | near Miles Green · Staffordshire | — | stepped | 440 m | 48 m | 10.9% | 24.0% | High |
| Peggysbank Dean to Slaley° | near Peggysbank Dean · Northumberland | — | sustained | 5015 m | 160 m | 3.2% | ≈29.3% | Needs confirmation |
| Pen Gwern-Llifion to Moel Grugoer° | near Clwt · Clwyd | — | stepped | 1602 m | 109 m | 6.8% | 23.0% | High |
| Pen-y-Bryn to Foel Gron° | near Llandegwning · Gwynedd | — | sustained | 2302 m | 106 m | 4.6% | 20.8% | Good |
| Pen-y-Ffridd | near Rhiwlas · Gwynedd | — | sustained | 1509 m | 154 m | 10.2% | 17.0% | Good |
| Pen-y-lan to Llangattock Vibon Avel | near Onen · Gwent | — | stepped | 677 m | 60 m | 8.8% | ≈26.5% | Good |
| Pencavo Hill | near Tideford · Cornwall | — | stepped | 832 m | 60 m | 7.2% | 23.0% | Good |
| Pencombe Rocks | near Parracombe · Devon | — | stepped | 1654 m | 72 m | 4.4% | 20.5% | Good |
| Pendine Hill | near Pendine · Dyfed | tag: 20% (2026) | sustained | 863 m | 88 m | 10.2% | 19.6% | High |
| Pengarrock Hill | near Porthallow · Cornwall | — | sustained | 1166 m | 83 m | 7.1% | ≈24.0% | Needs confirmation |
| Penglais Hill | near Aberystwyth · Dyfed | sign: 11% (2026, via OSM) | sustained | 1310 m | 97 m | 7.4% | 11.2% | High |
| Penpoll to Lanteglos Highway° | near Penpoll · Cornwall | — | sustained | 985 m | 95 m | 9.6% | 23.1% | Needs confirmation |
| Penpoll to Manely° | near Penpoll · Cornwall | — | stepped | 1525 m | 80 m | 5.3% | 20.5% | Good |
| Penpont to Pendrift° | near Penpont · Cornwall | — | sustained | 2107 m | 112 m | 5.3% | 26.5% | Needs confirmation |
| Penstone to Bradninch° | near Hele · Devon | — | sustained | 2901 m | 157 m | 5.4% | 20.3% | Good |
| Pentonwarra Point to Crugmeer° | near Trevone · Cornwall | — | stepped | 828 m | 57 m | 6.8% | 20.9% | High |
| Pentre Grove | near Rhydspence · Herefordshire | — | sustained | 3307 m | 105 m | 3.2% | 27.8% | Needs confirmation |
| Pentre to Moat Hill° | near Pentre · Powys | — | sustained | 4346 m | 201 m | 4.6% | 23.4% | Good |
| Pentre-Cwm to Marian Cwm° | near Cwm · Clwyd | — | stepped | 1439 m | 91 m | 6.3% | 20.6% | Good |
| Pentre-dwfr to Moel y Faen° | near Pentre-dwfr · Clwyd | — | sustained | 1957 m | 216 m | 11.0% | 21.1% | High |
| Penventinnie Lane | near Treliske · Cornwall | — | sustained | 682 m | 59 m | 8.7% | 20.2% | High |
| Penybryn | near Corwen · Clwyd | — | sustained | 395 m | 47 m | 12.0% | 24.5% | Needs confirmation |
| Penygraig Terrace | near Ynysybwl · Mid Glamorgan | — | sustained | 445 m | 46 m | 10.4% | 20.3% | High |
| Penygraigwen to Llanwonno° | near Pontypridd · Mid Glamorgan | — | sustained | 7613 m | 265 m | 3.5% | 18.8% | Good |
| Peter Tavy to Cox Tor° | near Peter Tavy · Devon | — | sustained | 1572 m | 118 m | 7.5% | 23.3% | High |
| Peters Lane | near Princes Risborough · Buckinghamshire | — | sustained | 1432 m | 129 m | 9.0% | 23.1% | Good |
| Pettfield Hill Road | near Tong Green · Kent | — | stepped | 926 m | 35 m | 3.8% | 22.9% | High |
| Petton to Haddon Hill° | near Petton · Devon | — | stepped | 4730 m | 168 m | 3.6% | 23.3% | Needs confirmation |
| Phipps Bottom to Yorkley° | near Yorkley · Gloucestershire | — | sustained | 1138 m | 108 m | 9.5% | 23.3% | High |
| Pillaton to Blunts° | near Pillaton · Cornwall | — | stepped | 4643 m | 114 m | 2.5% | 25.4% | Good |
| Pippacott to Halsinger° | near Pippacott · Devon | — | stepped | 3069 m | 112 m | 3.6% | 20.5% | Needs confirmation |
| Pisgah Hill | near Brynteg · Clwyd | — | sustained | 371 m | 43 m | 11.7% | 21.8% | Good |
| Pit Lane | near Thornton | — | sustained | 2297 m | 177 m | 7.7% | 20.9% | Good |
| Plymbridge Road | near Mainstone · Devon | — | sustained | 1188 m | 79 m | 6.6% | 23.7% | Needs confirmation |
| Polesteeple Hill | near Biggin Hill · Greater London | — | sustained | 365 m | 46 m | 12.7% | 20.2% | High |
| Polkirt Hill | near Mevagissey · Cornwall | — | sustained | 343 m | 46 m | 13.3% | 26.4% | High |
| Polpeor Island to Lion's Den° | near Lizard · Cornwall | — | stepped | 458 m | 34 m | 7.4% | ≈21.4% | Needs confirmation |
| Ponsanooth to Trewedna Water° | near Ponsanooth · Cornwall | — | sustained | 981 m | 66 m | 6.7% | 21.2% | Good |
| Ponthir Road | near Caerllion · Gwent | tag: 20% (2026) | sustained | 242 m | 17 m | 7.0% | 12.4% | High |
| Pontrobert to Llanfihangel-yng-Ngwynfa° | near Pontrobert · Powys | — | stepped | 5432 m | 172 m | 3.2% | ≈26.1% | Good |
| Pool Combe to Ley Hill° | near Pool Combe · Somerset | — | sustained | 675 m | 87 m | 12.9% | 27.5% | Good |
| Porkellis to Carnmenellis° | near Porkellis · Cornwall | — | stepped | 2683 m | 73 m | 2.7% | 22.1% | High |
| Porlock to Pittcombe Head° | near Porlock · Somerset | — | stepped | 4392 m | 296 m | 6.7% | ≈19.7% | Good |
| Port Quin to Trevan Point° | near Port Quin · Cornwall | — | stepped | 1139 m | 71 m | 6.2% | 22.1% | Needs confirmation |
| Porthallow to Talland° | near Carey Park · Cornwall | — | sustained | 949 m | 120 m | 12.6% | ≈24.1% | Good |
| Porthkerris Point to Pol Lawrance° | near Trenance · Cornwall | — | sustained | 550 m | 61 m | 11.1% | 20.4% | High |
| Porthmeor Hill | near St Ives · Cornwall | — | sustained | 263 m | 29 m | 10.9% | 21.5% | High |
| Portlooe to Talland° | near Looe · Cornwall | — | stepped | 993 m | 30 m | 3.0% | 20.8% | High |
| Portway | near Upton St Leonards · Gloucestershire | — | stepped | 1939 m | 142 m | 7.3% | 21.4% | Needs confirmation |
| Portway Hill | near Batcombe · Somerset | — | stepped | 1173 m | 57 m | 4.9% | 20.2% | High |
| Post Lane | near Malmsmead · Devon | — | sustained | 1315 m | 116 m | 8.8% | 20.5% | Good |
| Pound Lane | — | sustained | 668 m | 89 m | 13.4% | ≈26.2% | Good | |
| Prenol to Pont Bronferiaeth° | near Pentrefelin · Clwyd | — | stepped | 2442 m | 128 m | 5.2% | ≈26.7% | Good |
| Prenteg to Cwm Ystradllyn° | near Prenteg · Gwynedd | — | stepped | 4445 m | 191 m | 4.3% | 24.7% | Good |
| Primrose Hill | tag: 12% (2026) | sustained | 1100 m | 96 m | 8.8% | 17.1% | Good | |
| Prior Avenue | near Richmond · North Yorkshire | — | stepped | 617 m | 37 m | 6.0% | 22.2% | High |
| Priston Lane | near Priston · Somerset | — | sustained | 1775 m | 92 m | 5.2% | 25.6% | Good |
| Prospect Place | near Bradway Bank | — | sustained | 239 m | 33 m | 13.7% | 20.4% | High |
| Puddington Bottom to Poughill° | near Puddington · Devon | — | stepped | 2135 m | 85 m | 4.0% | 22.7% | Good |
| Puddington to Pennymoor° | near Puddington · Devon | — | stepped | 3048 m | 37 m | 1.2% | 26.7% | Needs confirmation |
| Pudsey Road | near Cornholme | — | sustained | 2035 m | 208 m | 10.2% | 21.3% | Needs confirmation |
| Putley Green to Woolhope Cockshoot° | near Putley Green · Herefordshire | — | sustained | 2065 m | 112 m | 5.4% | 25.2% | High |
| Putley to Woolhope Cockshoot° | near Putley · Herefordshire | — | stepped | 1218 m | 99 m | 8.1% | 25.2% | High |
| Pwllglas to Clocaenog° | near Pwll-glâs · Clwyd | — | sustained | 4129 m | 164 m | 4.0% | 23.4% | Good |
| Radford Street | near Darwen · Lancashire | — | sustained | 277 m | 30 m | 11.0% | 20.1% | High |
| Ramsden Street | near Ovenden Wood | — | sustained | 958 m | 84 m | 8.8% | 20.1% | High |
| Rangeley Road | near Woodland View | — | sustained | 470 m | 73 m | 15.5% | 20.6% | High |
| Raw Bank | near Langthwaite · North Yorkshire | — | sustained | 674 m | 55 m | 8.1% | 23.9% | Good |
| Red Lane | near Milton · Derbyshire | — | stepped | 731 m | 47 m | 6.4% | 20.5% | Good |
| Red Way | near Little Fryup Dale · North Yorkshire | — | sustained | 1060 m | 67 m | 6.3% | 21.7% | High |
| Redesmouth to Woodcock Hill° | near Redesmouth · Northumberland | — | sustained | 2389 m | 117 m | 4.9% | ≈22.1% | Good |
| Redhouse Lane | near Ryeford · Gloucestershire | — | sustained | 2109 m | 151 m | 7.2% | 22.9% | High |
| Redpost to Middle Taphouse° | near Redpost · Cornwall | — | stepped | 1784 m | 132 m | 7.4% | ≈26.7% | Needs confirmation |
| Rerwick Road | near Bigton · Shetland Islands | — | sustained | 5778 m | 158 m | 2.7% | 16.2% | Good |
| Restronguet Hill | near Harcourt · Cornwall | — | sustained | 632 m | 73 m | 11.5% | 20.5% | Needs confirmation |
| Reybridge to Nocketts Hill° | near Reybridge · Wiltshire | — | sustained | 1715 m | 131 m | 7.6% | 21.1% | High |
| Reynolds Lane | near Wordley Dingle · Worcestershire | — | sustained | 901 m | 63 m | 7.0% | 22.2% | High |
| Rhigos Road | near Treherbert · Mid Glamorgan | 100 Climbs1 | sustained | 6004 m | 305 m | 5.1% | 8.6% | High |
| Rhiw Fain | near Pentre-llyn · Dyfed | — | sustained | 1176 m | 132 m | 11.2% | 22.2% | Good |
| Rhiw Road | — | stepped | 2803 m | 190 m | 6.8% | ≈26.2% | Needs confirmation | |
| Rhiw Syr Dafydd | near Y Coed Duon · Gwent | — | sustained | 125 m | 26 m | 20.6% | ≈29.6% | Good |
| Rhos-y-gwaliau to Is-Afon° | near Y Bala · Gwynedd | — | sustained | 2365 m | 132 m | 5.6% | 23.2% | Good |
| Rhyd-y-foel to Coed Bettws | near Rhyd-y-foel · Clwyd | — | sustained | 1266 m | 134 m | 10.6% | ≈27.5% | Good |
| Rhyd-y-saint to Bryn-têg° | near Rhyd-y-saint · Dyfed | — | sustained | 1531 m | 52 m | 3.4% | 23.9% | High |
| Richard Street | near Pontycymer · Mid Glamorgan | — | sustained | 528 m | 50 m | 9.4% | 20.5% | Good |
| Ridehalgh Lane | near Thursden · Lancashire | — | stepped | 551 m | 49 m | 8.9% | 26.9% | Good |
| Ridge Hill | near Berrynarbor · Devon | — | sustained | 859 m | 97 m | 11.3% | 21.3% | High |
| Ridge Top Lane | near Langrish · Hampshire | — | stepped | 874 m | 38 m | 4.3% | 17.9% | High |
| Ripley Bank | near Pateley Bridge · North Yorkshire | — | sustained | 1886 m | 110 m | 5.8% | 21.1% | High |
| Ripponden New Bank | near Ripponden | — | sustained | 1007 m | 130 m | 12.9% | 21.6% | Needs confirmation |
| Ripponden Old Lane | near Ripponden | — | stepped | 2246 m | 156 m | 6.9% | 20.3% | Needs confirmation |
| Rishworth Mill Lane | near Rishworth | — | sustained | 1621 m | 145 m | 9.0% | 20.5% | Good |
| Roach Road | near Upper Hulme · Staffordshire | — | sustained | 714 m | 53 m | 7.5% | 20.2% | High |
| Rock Dingle to Flannog Dingle° | near Rock Dingle · Shropshire | — | sustained | 1260 m | 66 m | 5.3% | 20.8% | High |
| Rock House Lane | near Maidencombe · Devon | — | sustained | 1029 m | 119 m | 11.5% | ≈27.6% | Needs confirmation |
| Rock Lane | near West Bagborough · Somerset | — | sustained | 854 m | 66 m | 7.7% | 21.6% | High |
| Rockcliffe Avenue | near Shipley | — | stepped | 676 m | 45 m | 6.7% | 24.2% | High |
| Roman Reach | near Caerllion · Gwent | tag: 20% (2026) | sustained | 396 m | 20 m | 5.1% | 10.1% | High |
| Roman Way | near Caerllion · Gwent | tag: 30% (2021) | sustained | 566 m | 22 m | 3.8% | 12.1% | High |
| Roncombe Hill | near Cotford · Devon | — | stepped | 1292 m | 121 m | 9.4% | 22.8% | Needs confirmation |
| Ronhill Lane | near Cleobury Mortimer · Shropshire | — | stepped | 477 m | 43 m | 9.0% | 20.1% | Good |
| Rooks Hill | near Underriver · Kent | — | stepped | 1278 m | 98 m | 7.7% | 24.6% | Needs confirmation |
| Rooksmoor Hill | near Woodchester · Gloucestershire | — | sustained | 632 m | 94 m | 14.9% | 26.5% | Good |
| Rooksmoor to Kingscourt° | near Woodchester · Gloucestershire | — | sustained | 2144 m | 118 m | 5.5% | 24.4% | Good |
| Room Hill Road | near Hawkridge · Somerset | — | stepped | 2490 m | 134 m | 5.4% | 21.7% | High |
| Rorrington to Hemford° | near Rorrington · Shropshire | — | stepped | 3946 m | 190 m | 4.8% | 30.2% | Good |
| Rose Grove Lane | near Sowerby Bridge | — | sustained | 1637 m | 165 m | 10.1% | ≈27.2% | Good |
| Rose Hill | near Abertawe · West Glamorgan | — | sustained | 488 m | 56 m | 11.4% | 20.2% | Good |
| Rosedale Chimney Bank | near Rosedale Abbey · North Yorkshire | 100 Climbs1, National HC2, Wikipedia3 | sustained | 1107 m | 149 m | 13.4% | 26.6% | High |
| Rosemundy | near St Agnes · Cornwall | — | sustained | 1608 m | 98 m | 6.1% | 20.3% | High |
| Rosenannon to Tregonetha° | near Rosenannon · Cornwall | — | stepped | 1539 m | 70 m | 4.5% | ≈20.7% | Needs confirmation |
| Rotten Row Hill | near Tutts Clump · Berkshire | — | sustained | 393 m | 35 m | 8.9% | 21.5% | Good |
| Roundball Lane | near Littletown · Devon | — | sustained | 1322 m | 97 m | 7.3% | 22.9% | Good |
| Route Des Alpes | near Gwaelod-y-garth · South Glamorgan | — | stepped | 2169 m | 148 m | 6.8% | ≈31.0% | Good |
| Rowhorne Road | near Nadderwater · Devon | — | sustained | 3798 m | 156 m | 4.1% | 22.1% | Needs confirmation |
| Roxby Lane | near Staithes · North Yorkshire | — | sustained | 3117 m | 184 m | 5.9% | 20.3% | Needs confirmation |
| Rushock | near Kington · Herefordshire | — | sustained | 1698 m | 103 m | 6.1% | 25.6% | High |
| Ruthin Road | near Mold · Clwyd | — | sustained | 2228 m | 111 m | 5.0% | 11.3% | Good |
| Rutts Lane | near Littleton Panell · Wiltshire | — | sustained | 736 m | 70 m | 9.4% | 20.4% | High |
| Rye Hill | near Ponsanooth · Cornwall | — | sustained | 333 m | 41 m | 12.4% | 21.6% | Needs confirmation |
| Sabden Road | near Padiham · Lancashire | — | sustained | 1560 m | 108 m | 6.9% | 20.3% | Good |
| Saintbury Hill | near Saintbury · Gloucestershire | — | sustained | 2340 m | 190 m | 8.1% | 28.6% | Needs confirmation |
| Saltstone to Bridwill Point° | near Widemouth Bay · Cornwall | — | sustained | 1086 m | 86 m | 7.9% | 20.1% | Needs confirmation |
| Sampford Spiney to Ingra Tor° | near Sampford Spiney · Devon | — | sustained | 900 m | 112 m | 12.5% | 20.2% | Good |
| Sanctuary Lane | near Brompton Regis · Somerset | — | sustained | 1126 m | 109 m | 9.6% | 22.3% | High |
| Sand Hill | near Carey Park · Cornwall | — | sustained | 599 m | 81 m | 13.6% | 21.8% | High |
| Sandbeck to Coalpit Hill° | near Richmond · North Yorkshire | — | sustained | 3585 m | 126 m | 3.5% | 20.3% | Good |
| Sandford to Newbuildings° | near Sandford · Devon | — | sustained | 2572 m | 93 m | 3.6% | 22.3% | Needs confirmation |
| Sapey Bridge to Brockhampton Dingle° | near Meadow Green · Herefordshire | — | stepped | 4425 m | 115 m | 2.6% | 20.9% | Needs confirmation |
| Sarn Mellteyrn to Mynydd Rhiw° | near Sarn Mellteyrn · Gwynedd | — | sustained | 1793 m | 151 m | 8.4% | 21.4% | Needs confirmation |
| Savile Road | near Hebden Bridge | — | sustained | 2705 m | 216 m | 8.0% | 24.2% | Needs confirmation |
| Sawood Lane | near Leeming | — | sustained | 493 m | 49 m | 9.8% | 20.5% | High |
| Scar Hole Lane | near Jackson Bridge | — | sustained | 1434 m | 153 m | 10.7% | 20.2% | High |
| Scar Lane | near Scotland Bank · Herefordshire | — | stepped | 1617 m | 115 m | 7.1% | 22.0% | Needs confirmation |
| Schofield Road | near Rawtenstall · Lancashire | — | sustained | 950 m | 74 m | 7.8% | 20.2% | High |
| School Road | near Bowden · Devon | — | sustained | 826 m | 83 m | 10.0% | ≈26.9% | Good |
| School Street | near Maerdy · Mid Glamorgan | — | sustained | 497 m | 53 m | 10.7% | 20.1% | High |
| Scout Road | near Scout · Lancashire | — | sustained | 198 m | 24 m | 12.0% | 22.4% | High |
| Scutterthill Bank | near Westgate · County Durham | — | sustained | 3345 m | 250 m | 7.5% | 23.9% | High |
| Seller's Wood Hill | near Branscombe · Devon | — | stepped | 1914 m | 118 m | 6.2% | 20.9% | Good |
| Sennybridge to Yr Allt° | near Sennybridge · Powys | — | sustained | 1412 m | 56 m | 3.9% | ≈29.5% | Good |
| Shakespeare Road | near Dover · Kent | — | stepped | 444 m | 38 m | 8.6% | 26.8% | High |
| Shatton Lane | near Shatton · Derbyshire | — | sustained | 1108 m | 149 m | 13.5% | 22.1% | High |
| Shaw Hill to Grain Hill° | near Ashkirk · Scottish Borders | — | sustained | 3588 m | 157 m | 4.4% | ≈14.8% | Good |
| Shawclose Lane | near Hawnby · North Yorkshire | — | stepped | 1366 m | 89 m | 6.5% | 21.0% | High |
| Sheepstor to Sheeps Tor° | near Sheepstor · Devon | — | sustained | 840 m | 68 m | 8.1% | 21.1% | Good |
| Sheepwalks Lane | near Compton · Staffordshire | — | sustained | 3326 m | 137 m | 4.1% | 23.4% | High |
| Shell Lane | near Templeton · Devon | — | stepped | 1902 m | 90 m | 4.7% | 21.1% | Good |
| Shelly Road | near South Zeal · Devon | — | sustained | 972 m | 80 m | 8.2% | 22.7% | Good |
| Shepherds Lane | near Teignmouth · Devon | — | sustained | 2046 m | 216 m | 10.6% | ≈18.3% | Good |
| Shillingford to Quartley Hill° | near Shillingford · Devon | — | sustained | 2835 m | 176 m | 6.2% | 21.4% | Needs confirmation |
| Shirebrook Road | near Heeley | — | sustained | 468 m | 36 m | 7.6% | 20.3% | High |
| Shobrooke to Uppincott° | near Shobrooke · Devon | — | sustained | 1763 m | 71 m | 4.0% | 23.9% | Needs confirmation |
| Shop Hill | near Fylingthorpe · North Yorkshire | — | sustained | 1855 m | 131 m | 7.1% | 23.3% | High |
| Shute Lane | near Pensilva · Cornwall | — | sustained | 2018 m | 108 m | 5.4% | 22.4% | Needs confirmation |
| Side Gates Road | near Knott Head · Cumbria | — | sustained | 1168 m | 89 m | 7.6% | 22.0% | High |
| Side Gates Road | near Oxendale · Cumbria | — | sustained | 1195 m | 125 m | 10.5% | 20.5% | High |
| Sigford to Haytor Vale° | near Sigford · Devon | — | sustained | 2393 m | 120 m | 5.0% | 20.4% | Needs confirmation |
| Sigget Lane | near Todmorden | — | sustained | 1680 m | 168 m | 10.0% | 22.1% | Good |
| Signpost Lane | near East Village · Devon | — | sustained | 1019 m | 80 m | 7.9% | 23.1% | Good |
| Silver Hill | near Pateley Bridge · North Yorkshire | — | sustained | 2434 m | 194 m | 8.0% | 22.5% | Good |
| Silver Street to Dommett° | near Silver Street · Somerset | — | sustained | 2765 m | 142 m | 5.1% | 20.8% | High |
| Skew Hill | near Birley Edge | — | stepped | 1032 m | 52 m | 5.0% | 20.5% | High |
| Skirhead Lane | near Combe Martin · Devon | — | sustained | 819 m | 93 m | 11.3% | 21.3% | High |
| Slacks Lane | near Sedbergh · Cumbria | — | sustained | 1350 m | 85 m | 6.3% | 20.2% | High |
| Slade Hill | near Lustleigh · Devon | — | stepped | 2740 m | 156 m | 5.7% | 20.1% | High |
| Sled Gates | near Fylingthorpe · North Yorkshire | — | sustained | 1390 m | 148 m | 10.7% | 20.4% | High |
| Slinn Street | near Upperthorpe | — | sustained | 1207 m | 112 m | 9.3% | 20.0% | High |
| Smith's Lane | near Egton Bridge · North Yorkshire | — | stepped | 7636 m | 280 m | 3.7% | 22.1% | High |
| Snake Road | near Glossop · Derbyshire | — | sustained | 5105 m | 325 m | 6.4% | 8.2% | High |
| Snakelake Hill | near Bruton · Somerset | — | stepped | 1408 m | 62 m | 4.4% | ≈31.2% | Good |
| Snow Hill | near Bath · Somerset | — | sustained | 576 m | 64 m | 11.1% | 24.5% | High |
| Soar Road | tag: 20% (2026) | sustained | 394 m | 48 m | 12.1% | ≈20.8% | Needs confirmation | |
| Soutergate to Out Park° | near Soutergate · Cumbria | — | sustained | 2075 m | 235 m | 11.3% | ≈24.9% | Good |
| South Dean Lane | near Trentishoe · Devon | — | sustained | 2491 m | 197 m | 7.9% | 27.5% | Needs confirmation |
| South Woodchester to Littleworth° | near Woodchester · Gloucestershire | — | sustained | 1514 m | 154 m | 10.1% | 22.4% | High |
| Spark Bridge to Broughton Beck° | near Spark Bridge · Cumbria | — | sustained | 2339 m | 132 m | 5.7% | 20.1% | Good |
| Sparrow Lane | near Withypool · Somerset | — | stepped | 2198 m | 121 m | 5.5% | 22.1% | Needs confirmation |
| Speel Bank to Barnsley Hill° | near Little Arrad · Cumbria | — | stepped | 1920 m | 132 m | 6.9% | 20.2% | Good |
| Spencer Lane | near Hebden Bridge | — | sustained | 1236 m | 132 m | 10.7% | 23.8% | High |
| Spillmans Pitch | near Stroud · Gloucestershire | — | stepped | 546 m | 43 m | 7.9% | ≈27.1% | Good |
| Spirelake Hill | near Oldborough · Devon | — | stepped | 2087 m | 47 m | 2.2% | 23.1% | Needs confirmation |
| Spring Lane | near East Dundry · Somerset | — | sustained | 619 m | 62 m | 10.1% | 20.9% | High |
| Springfield Road | near Maerdy · Mid Glamorgan | — | sustained | 410 m | 29 m | 7.2% | 20.0% | High |
| St Ann's Road | near Great Malvern · Worcestershire | — | sustained | 824 m | 106 m | 12.8% | 21.3% | Needs confirmation |
| St Anthony-in-Meneage to Manaccan° | near St Anthony-in-Meneage · Cornwall | — | stepped | 2101 m | 74 m | 3.5% | 21.4% | High |
| St Blazey to Kilhallon° | near St Blazey · Cornwall | — | sustained | 503 m | 33 m | 6.6% | 20.4% | High |
| St Clement to Truro° | near St Clement · Cornwall | — | sustained | 793 m | 65 m | 8.2% | 20.1% | High |
| St Ishmael to Llansaint° | near St Ishmael · Dyfed | — | sustained | 1674 m | 116 m | 6.9% | 20.1% | Good |
| St Johns Lane | near St John · Cornwall | — | sustained | 1139 m | 106 m | 9.3% | 25.3% | Needs confirmation |
| St Michael Caerhays to Trevarrick° | near St Michael Caerhays · Cornwall | — | sustained | 3238 m | 67 m | 2.1% | 22.1% | Good |
| St Thomas Hill | near Launceston · Cornwall | — | sustained | 312 m | 36 m | 11.7% | 20.2% | High |
| St. Lawrence Road | near Dunmere · Cornwall | — | stepped | 1156 m | 50 m | 4.3% | 24.6% | High |
| St. Saviour's Hill | near Fowey · Cornwall | — | stepped | 336 m | 28 m | 8.5% | 24.6% | Good |
| Staddon Road | near Mudly Bottom · Devon | — | stepped | 1188 m | 93 m | 7.8% | ≈25.2% | Good |
| Staker's Cross Lane | near Hewish · Somerset | — | sustained | 1173 m | 93 m | 7.9% | 24.3% | Good |
| Stan Lane | near West Peckham · Kent | — | sustained | 954 m | 77 m | 8.1% | 20.8% | Needs confirmation |
| Stang Lane | near West Down · Devon | — | sustained | 1742 m | 94 m | 5.4% | 22.0% | High |
| Stanley Hill | near Totterdown · Bristol | — | stepped | 469 m | 39 m | 8.2% | 20.3% | High |
| Stanley Lane | near Bridgnorth · Shropshire | — | sustained | 4474 m | 85 m | 1.9% | 23.2% | Good |
| Stansfield Hall Road | near Todmorden | — | sustained | 2417 m | 235 m | 9.7% | ≈25.1% | Needs confirmation |
| Start Lane | near Kettleshulme · Cheshire | — | stepped | 864 m | 70 m | 8.1% | 20.7% | Needs confirmation |
| Station Lane | near Lower Wellhouse | — | sustained | 519 m | 64 m | 12.4% | ≈21.9% | Good |
| Station Road | near Maesygwartha · Gwent | — | sustained | 1988 m | 221 m | 11.1% | ≈26.4% | Good |
| Stickle Path | near Clayhanger · Devon | — | stepped | 996 m | 66 m | 6.6% | 30.0% | Needs confirmation |
| Stickleball Lane | near Steanbow · Somerset | — | stepped | 1748 m | 108 m | 6.2% | 27.9% | Good |
| Stile Way | near Pleck · Dorset | — | sustained | 1790 m | 118 m | 6.6% | 23.7% | Needs confirmation |
| Stock Ghyll Lane | near Ambleside · Cumbria | — | sustained | 914 m | 90 m | 9.9% | ≈26.3% | Needs confirmation |
| Stockleigh Pomeroy to Uppincott° | near Stockleigh Pomeroy · Devon | — | sustained | 1370 m | 115 m | 8.4% | 21.4% | Needs confirmation |
| Stocks Lane | near Luddenden | — | sustained | 2088 m | 222 m | 10.6% | 17.0% | Good |
| Stogumber to Higher Vexford° | near Stogumber · Somerset | — | sustained | 1673 m | 35 m | 2.1% | 21.0% | Good |
| Stone Ash Lane | near Langham Hill Bottom · Devon | — | stepped | 2745 m | 70 m | 2.5% | 20.2% | High |
| Stone Lane | near Bickleigh · Devon | — | sustained | 2216 m | 149 m | 6.7% | 20.5% | High |
| Stone Lane | near Exton · Somerset | — | stepped | 3222 m | 213 m | 6.6% | ≈20.1% | Good |
| Stoney Loanin | near Cushendall · County Antrim | — | sustained | 157 m | 21 m | 13.7% | 26.7% | Needs confirmation |
| Stoupe Bank | near Jet Holes · North Yorkshire | — | stepped | 770 m | 82 m | 10.7% | 27.1% | High |
| Stowford to Chittlehampton° | near Stowford · Devon | — | stepped | 3163 m | 77 m | 2.4% | 27.3% | Needs confirmation |
| Strada Florida Trailhead (Southernmost) to Pen y Cnwc° | near Coed Nant-yr-hwch · Powys | — | stepped | 2113 m | 160 m | 7.6% | 22.3% | High |
| Strait Lane | near Abbeystead · Lancashire | — | stepped | 381 m | 38 m | 9.9% | 25.8% | High |
| Studdon Dean to Holms Hill° | near Studdon Dean · Northumberland | — | sustained | 1645 m | 101 m | 6.1% | 20.7% | Good |
| Studland to Glebeland Estate° | near Studland · Dorset | — | stepped | 989 m | 60 m | 6.1% | 21.5% | High |
| Styes Lane | near Sowerby Bridge | — | sustained | 1244 m | 127 m | 10.2% | 21.1% | High |
| Sunningvale Avenue | near Biggin Hill · Greater London | — | sustained | 247 m | 31 m | 12.7% | 27.2% | High |
| Sunny Bank | near Aberhonddu · Powys | — | sustained | 451 m | 39 m | 8.6% | 23.1% | High |
| Sunny Bank Lane | near Cragg Vale | — | sustained | 588 m | 84 m | 14.4% | 30.3% | Needs confirmation |
| Susanna Hill to Brow Moor° | near Peter White Cliff · North Yorkshire | — | sustained | 1692 m | 139 m | 8.2% | 21.6% | Good |
| Sutton Bank | near Happy Valley · North Yorkshire | — | sustained | 1574 m | 175 m | 11.1% | 20.9% | High |
| Sutton-in-Craven to Lumb Clough° | near Sutton-in-Craven · North Yorkshire | — | sustained | 1351 m | 144 m | 10.7% | 21.2% | Needs confirmation |
| Swansea Road | near Clwydyfagwyr · Mid Glamorgan | — | sustained | 1815 m | 80 m | 4.4% | 22.3% | High |
| Swimbridge to Kerscott° | near Swimbridge · Devon | — | stepped | 2028 m | 53 m | 2.6% | 20.9% | Good |
| Tacker Street to Brendon Hills° | near Roadwater · Somerset | — | sustained | 4767 m | 316 m | 6.6% | ≈23.4% | Good |
| Tadwick Lane | near Upper Swainswick · Somerset | — | stepped | 499 m | 38 m | 7.6% | 20.1% | High |
| Tal-y-bont to Pen-y-gaer° | near Tal-y-bont · Clwyd | — | sustained | 3381 m | 335 m | 9.9% | 23.6% | Needs confirmation |
| Tan y Fron to Clwt° | near Tan-y-fron · Clwyd | — | sustained | 1331 m | 84 m | 6.3% | 22.0% | Good |
| Tan Y Lan Road | near Bae Colwyn · Clwyd | — | sustained | 531 m | 53 m | 9.9% | 20.8% | Good |
| Tan Yr Allt Avenue | near Mochdre · Clwyd | — | stepped | 611 m | 58 m | 9.5% | 23.0% | High |
| Tanners Street | near Ramsbottom | — | sustained | 781 m | 81 m | 10.3% | ≈24.0% | Needs confirmation |
| Tarrington to Seager Hill° | near Tarrington · Herefordshire | — | sustained | 937 m | 79 m | 8.4% | 22.8% | High |
| Teign Village to Hennock° | near Teign Village · Devon | — | sustained | 1893 m | 152 m | 8.0% | 23.4% | Good |
| Teigncombe to Middle Tor° | near Chagford · Devon | — | sustained | 2147 m | 126 m | 5.9% | ≈20.6% | Good |
| Terhill Lane | near Terhill · Somerset | — | sustained | 1553 m | 169 m | 10.9% | 25.2% | Good |
| The Batch | near Butcombe · Somerset | — | sustained | 462 m | 42 m | 9.2% | 22.4% | High |
| The Braes to Hill of Findon° | near Crovie · Aberdeenshire | — | sustained | 2186 m | 155 m | 7.1% | 22.7% | High |
| The Broadway | near Dursley · Gloucestershire | — | sustained | 749 m | 108 m | 14.4% | 20.7% | High |
| The Brune | near Channerwick · Shetland Islands | — | sustained | 257 m | 36 m | 14.2% | 22.1% | High |
| The Conduit | near Trefaldwyn · Powys | — | stepped | 743 m | 72 m | 9.6% | 27.5% | Needs confirmation |
| The Earl's Drive | near Kingsand · Cornwall | — | sustained | 1031 m | 92 m | 8.9% | 23.2% | Needs confirmation |
| The Greenway | near Heightington · Worcestershire | — | sustained | 1559 m | 39 m | 2.5% | 21.7% | High |
| The Hendre to Pen-y-lan° | near The Hendre · Gwent | — | sustained | 2447 m | 102 m | 4.2% | ≈26.5% | Needs confirmation |
| The Hill to Woodtown° | near Weare Giffard · Devon | — | stepped | 4302 m | 145 m | 3.4% | 20.9% | Good |
| The Knapp | near Minchinhampton · Gloucestershire | — | sustained | 739 m | 53 m | 7.1% | ≈26.7% | Good |
| The Raikes | near Wilsill · North Yorkshire | — | stepped | 928 m | 73 m | 7.8% | 20.0% | High |
| The Ross | near Cordon · North Ayrshire | — | sustained | 2255 m | 213 m | 9.5% | ≈14.3% | Needs confirmation |
| The Struggle (Kirkstone Road) | near Ambleside · Cumbria | 100 Climbs1, National HC2 | sustained | 1287 m | 157 m | 12.2% | 23.2% | Good |
| The Wychough | near Lower Wych · Clwyd | — | stepped | 1583 m | 45 m | 2.9% | 24.1% | Needs confirmation |
| Thick Hollins Road | near Meltham | — | stepped | 6282 m | 284 m | 4.5% | ≈16.1% | Good |
| Thomas Street | — | sustained | 414 m | 38 m | 9.2% | 22.2% | High | |
| Thorn Wath Lane | near Church Houses · North Yorkshire | — | sustained | 678 m | 79 m | 11.7% | 23.1% | Good |
| Thorne Lane | near Hoe Combe · Somerset | — | sustained | 975 m | 68 m | 6.9% | ≈23.0% | Needs confirmation |
| Thornton Hill | near Exeter · Devon | — | sustained | 414 m | 26 m | 6.3% | 20.2% | Good |
| Three Gates to Ramshorn Hill° | near Three Gates · Dorset | — | stepped | 3528 m | 127 m | 3.6% | 20.9% | Good |
| Thrussendale Road | near Acklam · North Yorkshire | — | sustained | 964 m | 95 m | 9.9% | 20.1% | High |
| Thurnham Lane | near Thurnham · Kent | — | sustained | 1743 m | 123 m | 7.1% | 20.8% | Needs confirmation |
| Thursden to Birkin Clough° | near Thursden · Lancashire | — | sustained | 1569 m | 135 m | 8.6% | 21.0% | High |
| Tideford to Hay Lake Bottom° | near Tideford · Cornwall | — | stepped | 1410 m | 92 m | 6.5% | 24.4% | Good |
| Tinker Lane | near Woodland View | — | sustained | 1034 m | 138 m | 13.4% | 20.6% | High |
| Tinker's Castle Road | near Upper Aston · Shropshire | — | stepped | 987 m | 41 m | 4.1% | 20.5% | Good |
| Tockholes Road | near Darwen · Lancashire | — | sustained | 818 m | 58 m | 7.1% | 25.9% | High |
| Tolcarne to St Day° | near Carharrack · Cornwall | — | stepped | 364 m | 35 m | 9.5% | 22.2% | Needs confirmation |
| Tongue Gate Hill | near Romansleigh · Devon | — | stepped | 1506 m | 113 m | 7.5% | 20.1% | Good |
| Torr Dubh to Glenmanuilt Hill° | near Glenmanuilt Glen · Argyll and Bute | — | sustained | 939 m | 93 m | 9.9% | 20.5% | Needs confirmation |
| Torre to Beggearn Huish° | near Washford · Somerset | — | sustained | 1493 m | 99 m | 6.6% | 27.4% | High |
| Totnes Down Hill | near Totnes · Devon | — | sustained | 1294 m | 142 m | 11.0% | ≈20.9% | Needs confirmation |
| Townend to Sparrowpit° | near Chapel-en-le-Frith · Derbyshire | — | sustained | 3149 m | 195 m | 6.2% | 20.1% | High |
| Tracebridge to Beacon Hill° | near Tracebridge · Somerset | — | stepped | 611 m | 55 m | 9.1% | ≈30.3% | Needs confirmation |
| Trallong to Cwm Brynych | — | sustained | 4833 m | 160 m | 3.3% | 24.7% | Needs confirmation | |
| Trebarwith Strand to Delabole° | near Trebarwith Strand · Cornwall | — | sustained | 2868 m | 204 m | 7.1% | 25.4% | Good |
| Trecangate to Bury Down° | near Trecangate · Cornwall | — | sustained | 1595 m | 95 m | 6.0% | 21.4% | Good |
| Tredegar Avenue | near Llanharan · Mid Glamorgan | tag: 20% (2026) | sustained | 228 m | 21 m | 9.4% | 16.6% | High |
| Tref-y-Clawdd to Garth Hill° | near Tref-y-Clawdd · Powys | — | stepped | 1316 m | 90 m | 6.9% | 22.7% | High |
| Trefanny Hill to Bury Down° | near Pendriscott · Cornwall | — | stepped | 2156 m | 127 m | 5.9% | 21.6% | Good |
| Treharris Mountain Road | near Treharris · Mid Glamorgan | — | sustained | 3562 m | 240 m | 6.7% | 22.0% | High |
| Treknow Lane | near Trelake · Cornwall | — | sustained | 392 m | 43 m | 10.9% | 25.4% | Good |
| Tremail to Trevivian° | near Tremail · Cornwall | — | sustained | 1545 m | 53 m | 3.4% | 22.4% | Needs confirmation |
| Trenoweth Hill to Roskruge Beacon° | near Porthallow · Cornwall | — | stepped | 1808 m | 99 m | 5.5% | 24.6% | Needs confirmation |
| Trentishoe Lane | near Trentishoe · Devon | — | stepped | 2386 m | 197 m | 8.3% | ≈22.4% | Good |
| Trevarrack to Treneere° | near Trevarrack · Cornwall | — | sustained | 1398 m | 69 m | 5.0% | 22.3% | Needs confirmation |
| Trevelmond Lane | near Trevelmond · Cornwall | — | stepped | 1350 m | 60 m | 4.4% | ≈21.3% | Needs confirmation |
| Trewarveneth Street | near Newlyn · Cornwall | — | sustained | 774 m | 100 m | 12.9% | ≈22.2% | Good |
| Trewethern to St Endellion° | near Chapel Amble · Cornwall | — | stepped | 2684 m | 97 m | 3.6% | 23.0% | Good |
| Trewey Hill | near Trewey · Cornwall | — | stepped | 1997 m | 107 m | 5.3% | 20.4% | High |
| Trewey to Trendrine Hill° | near Trewey · Cornwall | — | sustained | 1812 m | 93 m | 5.1% | 20.4% | High |
| Trewidland to Duloe° | near Trewidland · Cornwall | — | stepped | 1596 m | 113 m | 7.1% | 22.4% | High |
| Trewidland to Wringworthy° | near Trewidland · Cornwall | — | stepped | 2729 m | 57 m | 2.1% | 23.5% | Good |
| Trewoodloe to Golberdon° | near Golberdon · Cornwall | — | sustained | 1263 m | 67 m | 5.3% | 20.8% | Good |
| Treworlas to Spires Point° | near Treworlas · Cornwall | — | stepped | 516 m | 48 m | 9.3% | ≈23.1% | Good |
| Treyford to Treyford Hill° | near Treyford · West Sussex | — | sustained | 869 m | 87 m | 10.0% | 26.0% | High |
| Trinity View | near Caerllion · Gwent | tag: 40% (2021) | sustained | 602 m | 80 m | 13.3% | ≈22.9% | Good |
| Troed-y-Rhiw Road | near Wattsville · Gwent | — | stepped | 2603 m | 224 m | 8.6% | ≈26.3% | Good |
| Trooper Lane | near Halifax | — | sustained | 813 m | 137 m | 16.9% | ≈25.7% | Good |
| Tullecoombe Hill | near Rake · West Sussex | — | stepped | 1389 m | 76 m | 5.4% | 23.2% | Good |
| Turners Lane | near Whitehaven · Shropshire | — | sustained | 591 m | 53 m | 9.0% | 20.1% | High |
| Twitchen Lane | near Knightacott · Devon | — | stepped | 1950 m | 115 m | 5.9% | 21.6% | High |
| Twitchen to Round Hill° | near Twitchen · Devon | — | sustained | 3498 m | 147 m | 4.2% | 21.5% | Needs confirmation |
| Twitchen to Round Hill° | near Twitchen · Devon | — | sustained | 1702 m | 163 m | 9.6% | 21.5% | Needs confirmation |
| Twtil | near Harlech · Gwynedd | tag: 25% (2026) | sustained | 352 m | 50 m | 14.1% | 21.5% | Good |
| Twyn Gof Common to Cwm Dyfnant° | near Llandeilo Graban · Powys | — | sustained | 2933 m | 200 m | 6.8% | ≈26.4% | Good |
| Twyn-Garreg-Wen to Cwm Crew° | near Nant-ddu · Powys | — | sustained | 1953 m | 78 m | 4.0% | 10.1% | High |
| Ty Canol Lane | near Machen · Gwent | — | sustained | 2033 m | 210 m | 10.3% | 18.9% | Good |
| Ty Gwyn Road | near Llandudno · Clwyd | tag: 20% (2026) | sustained | 841 m | 96 m | 11.4% | 19.4% | High |
| Tylwch to Brynposteg Hill° | near Tylwch · Powys | — | sustained | 4281 m | 103 m | 2.4% | 20.0% | High |
| Tylwch to Oldchapel Hill | near Tylwch · Powys | — | sustained | 1916 m | 121 m | 6.3% | 23.8% | High |
| Tythecott to Buckland Brewer° | near Tythecott · Devon | — | stepped | 791 m | 72 m | 9.1% | 22.6% | Good |
| Ulpha to Rough Gill° | near Ulpha · Cumbria | — | stepped | 1944 m | 140 m | 7.2% | 21.5% | High |
| Underhill | near Glaisdale · North Yorkshire | — | sustained | 790 m | 91 m | 11.5% | 27.6% | Good |
| Unnamed lane near Llanfihangel-y-Creuddyn | near Cnwch Coch · Dyfed | — | stepped | 1171 m | 114 m | 9.7% | ≈27.1% | Good |
| Upcott Lane | near Hoe Combe · Somerset | — | sustained | 988 m | 106 m | 10.7% | ≈21.3% | Needs confirmation |
| Upland Lane | near West Liss · Hampshire | — | stepped | 979 m | 76 m | 7.8% | ≈20.6% | Good |
| Upottery to Reddick's Hill° | near Upottery · Devon | — | stepped | 1852 m | 102 m | 5.5% | 21.0% | Good |
| Upper Braddons Hill Road | near Torquay · Devon | — | sustained | 1037 m | 89 m | 8.6% | 20.0% | High |
| Upper Hergest | near Kington · Herefordshire | — | sustained | 1614 m | 162 m | 10.0% | ≈21.1% | Needs confirmation |
| Upper Mill Lane | near Prestbury · Gloucestershire | — | sustained | 1521 m | 126 m | 8.3% | 22.5% | High |
| Uppincott Lane | near Hollow Combe · Devon | — | stepped | 1917 m | 121 m | 6.3% | 20.4% | Good |
| Uton to Venny Tedburn° | near Fordton · Devon | — | sustained | 2780 m | 104 m | 3.8% | 20.8% | High |
| Valley Road | near Carbis Bay · Cornwall | — | sustained | 401 m | 54 m | 13.4% | 32.0% | High |
| Vellacott Lane | near Combe Martin · Devon | — | stepped | 3609 m | 149 m | 4.1% | 20.6% | Good |
| Vellow to Stogumber° | near Stogumber · Somerset | — | stepped | 1197 m | 52 m | 4.3% | 20.1% | High |
| Venford Hill | near Hawkridge · Somerset | — | sustained | 533 m | 81 m | 15.1% | ≈22.3% | Needs confirmation |
| Venn Road | near Landkey Town · Devon | — | sustained | 840 m | 73 m | 8.7% | ≈26.4% | Good |
| Venton to Wind Tor° | near Venton · Devon | — | stepped | 1901 m | 110 m | 5.8% | 23.6% | Good |
| Victoria Crescent | near Selkirk · Scottish Borders | — | sustained | 339 m | 42 m | 12.3% | 20.8% | High |
| Victoria Lane | near Lower Wellhouse | — | sustained | 330 m | 39 m | 11.9% | 20.4% | High |
| Victoria Street | near Tonypandy · Mid Glamorgan | — | stepped | 397 m | 33 m | 8.4% | 20.3% | Needs confirmation |
| Village Road | near Marldon · Devon | — | sustained | 861 m | 55 m | 6.4% | 21.3% | High |
| Vine Row | near Ystalyfera · West Glamorgan | — | sustained | 667 m | 82 m | 12.3% | ≈28.5% | Good |
| Vinegar Hill | near Offleyhay · Staffordshire | — | sustained | 641 m | 43 m | 6.7% | 21.7% | Needs confirmation |
| Viney Hill to Blakeney Hill° | near Viney Hill · Gloucestershire | — | sustained | 869 m | 86 m | 9.9% | 20.8% | Needs confirmation |
| Vowchurch Common | near Vowchurch · Herefordshire | — | stepped | 884 m | 78 m | 8.8% | 25.3% | High |
| Wadsworth Lane | near Hebden Bridge | — | sustained | 1800 m | 187 m | 10.4% | 20.3% | High |
| Wakefield Gate | near Pye Nest | — | sustained | 503 m | 58 m | 11.6% | 20.5% | High |
| Walter Clough Lane | near Wood Bottom | — | stepped | 904 m | 97 m | 10.7% | ≈21.7% | Good |
| Warend Hill | near Dursley · Gloucestershire | — | sustained | 824 m | 106 m | 12.9% | 28.6% | Good |
| Warkleigh to Chittlehamholt° | near Warkleigh · Devon | — | stepped | 1849 m | 47 m | 2.5% | 22.0% | High |
| Warland Gate | near Bottomley | — | sustained | 1021 m | 110 m | 10.8% | ≈25.7% | Good |
| Warleigh to Warleigh Hill° | near Claverton · Somerset | — | stepped | 1934 m | 125 m | 6.5% | 21.6% | Good |
| Wash to Bowden Head° | near Chapel-en-le-Frith · Derbyshire | — | sustained | 824 m | 90 m | 10.9% | 22.0% | Good |
| Washgate Lane | near Dowel Dale · Derbyshire | — | stepped | 759 m | 52 m | 6.9% | 20.4% | High |
| Watch Knott to Ludderburn Hill° | near Bowland Bridge · Cumbria | — | sustained | 1764 m | 120 m | 6.8% | ≈24.8% | Good |
| Watch Knott to Winster° | near Bowland Bridge · Cumbria | — | sustained | 2893 m | 57 m | 2.0% | 20.6% | High |
| Water Lane | near Oakridge Lynch · Gloucestershire | — | sustained | 1539 m | 123 m | 8.0% | ≈22.8% | Good |
| Waterloo Road | near Abersychan · Gwent | — | sustained | 897 m | 80 m | 9.0% | ≈24.5% | Good |
| Watermeetings Lane | near Marple | — | sustained | 445 m | 42 m | 9.3% | 21.1% | High |
| Waterpits | near Courtway · Somerset | — | sustained | 1372 m | 96 m | 7.0% | 21.8% | High |
| Watersmeet Road | near Lynton · Devon | — | sustained | 5116 m | 297 m | 5.8% | ≈16.8% | Good |
| Watroyd Lane | near Lower Wellhouse | — | sustained | 414 m | 50 m | 12.1% | 24.6% | High |
| Waydown Lane | near Timberscombe · Somerset | — | sustained | 791 m | 66 m | 8.3% | 20.1% | Needs confirmation |
| Wear Chare | near Bishop Auckland · County Durham | — | stepped | 320 m | 28 m | 8.7% | ≈20.3% | Needs confirmation |
| Weary Bank | near Foxton · North Yorkshire | — | stepped | 1446 m | 45 m | 3.1% | 28.4% | Needs confirmation |
| Well Bank | near Ireshopeburn · County Durham | — | sustained | 1020 m | 117 m | 11.5% | 21.4% | Good |
| Wellington to New Mill° | near Wellington · Cumbria | — | stepped | 1162 m | 85 m | 7.3% | ≈24.7% | Good |
| Wellshead Lane | near Rat Combe · Somerset | — | stepped | 2344 m | 136 m | 5.8% | 26.0% | Good |
| Welsh Harp Hollow | near Buttington · Powys | — | sustained | 3695 m | 304 m | 8.2% | 23.1% | Good |
| Wern-llaeth to Graig Ddu° | near Graig Ddu · Dyfed | — | sustained | 558 m | 47 m | 8.3% | 11.5% | High |
| Wessenden Head Road | near Meltham | — | sustained | 3315 m | 248 m | 7.5% | ≈11.7% | Good |
| West Bagborough Road | near Cothelstone · Somerset | — | sustained | 3064 m | 236 m | 7.7% | 23.3% | Needs confirmation |
| West Burridge Cross | near Filleigh · Devon | — | stepped | 2685 m | 113 m | 4.2% | 22.2% | Needs confirmation |
| West Portholland to Tregenna° | near West Portholland · Cornwall | — | sustained | 1102 m | 91 m | 8.3% | 20.4% | High |
| Westcliff Road | near Charmouth · Dorset | — | sustained | 559 m | 70 m | 12.5% | 24.1% | Good |
| Westend Lane | near Hanging Bottom · North Yorkshire | — | sustained | 1883 m | 103 m | 5.5% | 22.0% | Good |
| Westerland Lane | near Paignton · Devon | — | sustained | 1150 m | 63 m | 5.5% | 21.9% | Needs confirmation |
| Westhope Hill | near Westhope · Herefordshire | — | sustained | 1326 m | 121 m | 9.1% | ≈27.4% | Good |
| Westminster Bank | near Great Malvern · Worcestershire | — | stepped | 827 m | 55 m | 6.7% | 23.2% | High |
| Westville to Easton° | near Kingsbridge · Devon | — | stepped | 640 m | 46 m | 7.2% | 22.7% | High |
| Wetton Road | near Wetton · Staffordshire | — | stepped | 2143 m | 118 m | 5.5% | 24.3% | Good |
| Wharfedale Road | near Lancaster · Lancashire | — | stepped | 292 m | 27 m | 9.2% | 20.8% | High |
| Wheal Kitty Lane | near Trevellas Coombe · Cornwall | — | sustained | 473 m | 67 m | 14.1% | 20.3% | High |
| Whinny Lane | near East Law · County Durham | — | sustained | 1563 m | 115 m | 7.4% | 20.5% | High |
| Whitchurch Canonicorum to Morcombelake° | near Whitchurch Canonicorum · Dorset | — | sustained | 1314 m | 118 m | 9.0% | 22.0% | Needs confirmation |
| Whitchurch to Symonds Yat West° | near Whitchurch · Herefordshire | — | stepped | 2426 m | 138 m | 5.7% | 22.8% | Needs confirmation |
| White Snub to Hill of Findon° | near Gardenstown · Aberdeenshire | — | stepped | 3051 m | 176 m | 5.8% | 18.2% | Needs confirmation |
| Whitebrook Lane | near Carlingcott · Somerset | — | stepped | 1353 m | 88 m | 6.5% | 20.1% | Good |
| Whiteheads Lane | near Bradford-on-Avon · Wiltshire | — | sustained | 352 m | 38 m | 10.8% | 21.6% | Needs confirmation |
| Whiterock Road | near Belfast · County Antrim | — | sustained | 866 m | 103 m | 11.9% | ≈31.3% | Good |
| Whitty Lane | near Warley Town | — | sustained | 1275 m | 116 m | 9.1% | 27.0% | High |
| Widecombe in the Moor to Wind Tor° | near Widecombe in the Moor · Devon | — | sustained | 1135 m | 129 m | 11.3% | 22.1% | Good |
| Wiggaton to Bald Hill° | near Ottery St Mary · Devon | — | sustained | 1974 m | 130 m | 6.6% | 24.6% | Good |
| Wilcombe Cross | near Newtown · Devon | — | stepped | 1787 m | 127 m | 7.1% | ≈27.5% | Good |
| Willand to Smeatharpe° | near Willand · Somerset | — | sustained | 2178 m | 43 m | 2.0% | 28.1% | Good |
| Willhayes Hill | near Doddiscombsleigh · Devon | — | stepped | 2098 m | 105 m | 5.0% | ≈22.6% | Needs confirmation |
| Willing Gate | near Rattery · Devon | — | sustained | 1258 m | 48 m | 3.8% | 20.4% | High |
| Willingcott Hill | near North Buckland · Devon | — | stepped | 2318 m | 137 m | 5.9% | ≈20.4% | Needs confirmation |
| Willoway Lane | near Braunton · Devon | — | sustained | 1084 m | 96 m | 8.8% | 20.7% | Good |
| Willowpark Lane | near Coffinswell · Devon | — | stepped | 751 m | 38 m | 5.1% | 20.5% | Good |
| Wilton Way | near Abbotskerswell · Devon | — | sustained | 377 m | 38 m | 10.0% | 20.6% | Good |
| Winchcombe to Sudeley Hill° | near Winchcombe · Gloucestershire | — | sustained | 2765 m | 207 m | 7.5% | 21.1% | Good |
| Windball Hill | near Dulverton · Somerset | — | stepped | 1725 m | 148 m | 8.6% | 22.6% | High |
| Windsor Road | near Abertyleri · Gwent | — | sustained | 448 m | 40 m | 9.0% | 20.4% | High |
| Windwhistle Lane | near Woodford · Somerset | — | sustained | 3953 m | 277 m | 7.0% | ≈25.1% | Good |
| Winksley to Woodhouse Hill° | near Winksley · North Yorkshire | — | sustained | 1344 m | 52 m | 3.8% | 20.6% | Needs confirmation |
| Winn Lane | near Atlow · Derbyshire | — | sustained | 488 m | 51 m | 10.6% | 28.7% | Needs confirmation |
| Withens End Lane | near Rishworth | — | stepped | 1273 m | 61 m | 4.8% | 20.5% | Good |
| Withington to Chatterley° | near Withington · Gloucestershire | — | stepped | 1984 m | 108 m | 5.4% | 20.1% | High |
| Withleigh to Crockers Down° | near Withleigh · Devon | — | stepped | 1137 m | 69 m | 6.0% | ≈26.7% | Needs confirmation |
| Withyditch Lane | near Carlingcott · Somerset | — | sustained | 1480 m | 100 m | 6.8% | 22.3% | Good |
| Withypool to Room Hill° | near Withypool · Somerset | — | stepped | 1218 m | 104 m | 8.6% | ≈23.8% | Good |
| Wood Lane | near Dartmouth · Devon | — | stepped | 718 m | 74 m | 10.3% | ≈20.0% | Good |
| Wood Lane | near Sowerby Bridge | — | sustained | 743 m | 95 m | 12.8% | 24.1% | High |
| Wood Royd Road | near Stocksbridge | — | sustained | 897 m | 65 m | 7.2% | 20.8% | Good |
| Wood Street | near Maerdy · Mid Glamorgan | — | sustained | 245 m | 29 m | 12.0% | 20.0% | High |
| Woodcock Lane | near The Bank · Cheshire | — | sustained | 987 m | 99 m | 10.1% | 21.5% | High |
| Woodfall Lane | near Low Bradfield | — | sustained | 917 m | 104 m | 11.4% | 20.6% | Good |
| Woodford to Blackawton° | near Blackawton · Devon | — | sustained | 595 m | 58 m | 9.7% | ≈27.6% | Needs confirmation |
| Woodland Park Road | — | sustained | 810 m | 60 m | 7.3% | 23.9% | Needs confirmation | |
| Woodside View | near Holmfirth | — | sustained | 318 m | 36 m | 11.2% | 22.5% | High |
| Woolacombe Station Road | near Woolacombe · Devon | — | stepped | 2501 m | 145 m | 5.8% | ≈26.6% | Good |
| Worlington Hill | near Instow · Devon | — | sustained | 368 m | 58 m | 15.7% | ≈25.1% | Good |
| Wormcliffe Lane | near Ashley · Wiltshire | — | stepped | 2034 m | 101 m | 5.0% | 22.5% | Needs confirmation |
| Worth Lane | near Fox Combe · Somerset | — | sustained | 759 m | 94 m | 12.4% | 20.0% | High |
| Wreay to Watermillock Fell° | near Wreay · Cumbria | — | stepped | 2051 m | 134 m | 6.5% | ≈21.8% | Good |
| Wrynose Pass | near Hollin Slack · Cumbria | 100 Climbs1, Wikipedia3 | sustained | 1028 m | 108 m | 10.5% | 24.6% | High |
| Wyke Road | near Castle Cary · Somerset | — | sustained | 1254 m | 75 m | 5.9% | ≈21.9% | Good |
| Wynniatts Way | near Abberley · Worcestershire | — | sustained | 812 m | 104 m | 12.8% | 23.3% | High |
| Yard Downs Lane | near Stockwell · Devon | — | sustained | 1431 m | 149 m | 10.4% | 22.3% | High |
| Yarde to Galloping Bottom° | near Yarde · Somerset | — | sustained | 5500 m | 278 m | 5.1% | 16.9% | Good |
| Yarnacott to Hutcherton Down° | near Swimbridge · Devon | — | sustained | 1617 m | 120 m | 7.4% | ≈20.3% | Good |
| Yartleton Lane | near Lea Line · Herefordshire | — | sustained | 1212 m | 105 m | 8.7% | 25.1% | High |
| Yealscombe Lane | near Exford · Somerset | — | stepped | 599 m | 45 m | 7.5% | 21.5% | High |
| Yearnor Mill Lane | near Porlock Weir · Somerset | — | sustained | 4361 m | 369 m | 8.5% | ≈24.0% | Needs confirmation |
| Yeo Hill | near Bishop's Nympton · Devon | — | stepped | 2001 m | 113 m | 5.6% | 22.2% | Good |
| Yeolmbridge to Langdon° | near Yeolmbridge · Cornwall | — | sustained | 1578 m | 60 m | 3.8% | 20.2% | High |
| Yr Allt | near Allt · Dyfed | — | sustained | 537 m | 57 m | 10.5% | ≈27.8% | Good |
| Yr Allt | near Allt · Dyfed | — | sustained | 562 m | 51 m | 9.0% | ≈27.8% | Good |
° provisional name — auto-suggested from nearby map places, no local-usage evidence; renames welcome (each climb page has the details).
Sources: 1 100 Greatest Cycling Climbs (Simon Warren) · 2 British National Hill Climb Championship · 3 Wikipedia · 4 Simon Warren 100 Climbs app (Wales collections) · 5 Another 100 Greatest Cycling Climbs (Simon Warren) · 6 Guinness World Records · 7 Tour of Britain