Casting has started for the new Coronation Street musical and Katherine Kelly will be on stage playing her on-screen character of Becky McDonald. Or at least, that is, according to the News of the World.Hmmm... I'm not sure a TV actress could combine her acting up in Manchester with a stage show in London although the tabloid does say that Katherine has agreed a deal with Corrie bosses to leave the show to star in the musical, but is expected to return at a later date.