A final insult, the wall is the most severe grade you will face on this run. Slippery packed snow makes you hunt for traction and you have to shift to your lowest gear. Nestled between boulders and rock, the wall is a short, steep grind. An ice-coated landscape greets the runners finishing in the shadow of Castle Craig. And a 3.1 mile run back down the mountain.
All finishers receive a commemorative patch.
This year it celebrates the fact that Castle Craig has now been perched on East Peak in Meriden for 100 years.