We're not advocating James Gandolfini go on a diet - far from it. This is about Deborah Voigt, the American soprano banished from the Royal Opera House four years ago for, well, how can we put this delicately: tipping the scales at a heftier than optimal weight. Last night she made her return to the Covent Garden stage - having lost 10 stone in the meantime. The Royal Opera was heavily criticised when, having......