Back in March, one of the TV journalists standing outside Vanity Fair magazine’s Oscars party spotted an unlikely figure among the film stars and movie directors. “Sir Alex,” she shouted. “What are you doing here?”“I’m retired now,” said Manchester United’s former manager, Sir Alex Ferguson, before he headed in to the bash. “I’ve got nothing else to do.”Unfortunately for his successor, David Moyes, Sir Alex failed to spend all his free time at parties in California, or even tending his racehorses or his wine collection. Instead, he spent a large part of it in the directors’ box at Old Trafford, emphasising how much of a looming presence he still was at the football club, following his stepping down from the mana