Knacker Cracker

The Knacker Cracker is a challenging 10K trail race held annually at Box Hill, Surrey, starting from Denbies Vineyard near Dorking, UK. Known as "Britain's toughest 10k," the course features a demanding route with 473m of ascent and 335m of descent over rough, steep, and often slippery terrain. The race offers spectacular views of the North Downs, Mole Gap, Denbies Vineyard, and Dorking.

It includes multiple steep climbs, notably through Happy Valley, and forbids headphones to encourage runner interaction. The event also features a kids' fun run and a ladies' race. Parking and registration are at Denbies Vineyard, with the finish at the top of Box Hill. Visit the organization's website for the most recent information.