Ben Elton's script is back in the West End, and this time he stars, too Twenty-one years ago, critics were alarmed by Ben Elton's deranged musical We Will Rock You. But, despite the "staggeringly awful" reviews, the show somehow went on to have 12 long (and painful) years of West End success. So, here we are again. The car crash of a show is back for a summer run at the London Coliseum. But has it made any progress i…