This non-stop race, governed by UK:Athletics rules and authorized by British Waterways, begins at Gas Street Basin in Birmingham and follows the marked Grand Union Canal Towpath all the way to Little Venice, London. While runners are encouraged to have their own support crews, the organizer can accommodate up to 40 unsupported participants. Many previous finishers have reported that this annual race, being the longest in Britain, presents a level of difficulty that rivals other ultra-distance events of comparable length. The scenic route along the canal provides an engaging backdrop as competitors tackle the challenging course.