Ian Hislop continues his investigation into the confused and conflicting history of the patron saints of Britain and Ireland. Ask most Welsh people who St David was and the response will probably include an old man with a dove on his shoulder, a recollection that he liked "doing the little things" and the puzzled reference to a leek. So Ian is rather surprised to find that the real St David was a monk, conceived as a result of a sexual assault, who liked to stand up to his neck in freezing cold water. How he became the patron saint of anywhere, never mind Wales, is a long story.