Could Olympic judges be biased?

The American Swimmer, Michael Phelps tonight became the most decorated Olympian ever... In swimming, there's not much doubt about who wins but what about the sports where judges decide who gets the medals? Yesterday, there were celebrations when the British men's gymnastics team, won their first medal in a century. But initially, team GB was in silver position but was pushed back down into third place, after an appeal. So how objective are the judges and is it always obvious when things aren't quite right? Philip Barker, an Olympic Historian, joined us on the line from the Team GB house at Stratford.