A continuous 300km coast-to-coast ultra marathon following Wainwright's iconic route from St Bees on the west coast to Robin Hood's Bay on the east coast, crossing three National Parks: the Lake District, Yorkshire Dales and North York Moors. The clock never stops running from start to finish, including rest periods. Fully supported with manned aid stations every 25–50km offering hot food, medical support and sleeping facilities. Previously run by Ourea Events, the 2027 edition is operated by Ultra X after acquiring the event in April 2026. All 2026 entries were transferred to 2027.