Mark Cavendish: Is Olympic gold at end of the rainbow?

Mark Cavendish is a perfectionist. This probably explains his elephant-like memory ("I can remember every detail, metre by metre, of a stage I won in a Tour of Berlin as an amateur" he once told me – four years after the event) and his hatred of failure ("I can accept losing because of bad luck, but to miss out on something I should have won, it destroys me.")