He was one of the hardest, most controversial footballers of his generation: the £20million man who became the first professional player to go to jail for an offence committed on the field of play. He was the fans’ hero who disappeared.Duncan Ferguson was an old-fashioned Scottish centre-forward who went from a boarding house in Dundee to the marble staircase of Rangers in a record-breaking transfer.His £4m move from Dundee United to Ibrox made him British football’s most ex...