This edition focuses on the treatment of sport enthusiasts who have had accidents on two wheels. Billy, 19, has been thrown 20ft from his motocross bike during a race, suffering multiple spinal injuries. Teacher Dave, 53, has facial injuries after riding his new bicycle into the back of a stationary car in Richmond Park, while 30-year-old adrenaline junkie and former Royal Marine Richard has badly dislocated his thumb after falling off a bike