Stephen Sackur speaks to Mark Cavendish, the winner of more Tour de France stages than any other Briton, and asks if cycling has cleaned up its act and thrown out the cheats.

HARDtalk speaks to Mark Cavendish, who over the past five years has enjoyed the reputation of being the fastest man on two wheels. He is a cycling phenomenon - an explosive sprinter, a world champion and the winner of more Tour de France stages than any other Briton. He also has a reputation for blunt talk in a sport tainted by illegal drug use. So, has cycling cleaned up its act and thrown out the cheats?