A point-to-point ultra from Wendover to London measuring 69.6 km (43 miles) with around 820 m+ of elevation gain. The route crosses Buckinghamshire countryside trails in the first half before joining the Grand Union Canal towpath for the run into the capital. Surfaces are mixed early on (trail and tracks), then predominantly towpath on the canal section. The organiser’s website sets the navigation approach and any aid station or checkpoint arrangements.