A backyard-format endurance race held at Hardwick Hall in Derbyshire. Participants complete a 4.167 mile (6.7 km) loop every hour on the hour until only one runner completes a final solo lap. Terrain typically consists of parkland paths and trail within the estate grounds, though specific course details are defined by the organiser. Race operations follow standard backyard ultra rules, with venue logistics and facilities outlined in the official event information.