Hardknott Pass, Cumbria
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York's Hill hosts the annual Catford hill climb, the world's oldest bike race (pic: Bareknuckleyellow, via Flickr Creative Commons)
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Hardknott Pass is the most brutal of the grueling Lake District passes (pic: Eifion, via Flickr Creative Commons)
Hardknott Pass, Cumbria
Last but by no means least, Hardknott Pass. Riders to have tackled the Fred Whitton Challenge will attest to the pain served up by this climb in the Lake District.
With an average gradient of 13 per cent, the climb actually kicks up to 33 per cent in parts with a series of brutal switchbacks.
The first pair kick up to 20 per cent while the next is the final nail in the coffin for many riders as the road reaches its maximum gradient.
One of a number of fierce climbs in the Lake District, the Hardknott Pass is arguably the most fearsome of the lot.
Vital statistics
Length: 2.2km
Elevation: 298m
Average gradient: 13 per cent
Maximum gradient: 33 per cent