Sir Keir Starmer is a Prime Minister In Waiting. The job is not in the bag unless and until the votes have been cast in Labour's favour - as he and his close advisers are the first to point out. But all the circumstantial evidence from elections and opinion polls suggests that Starmer is far and away the person most likely to be the occupant of 10 Downing Street after the general election due in the next 11 months. PMIW is not a status conferred on all opposition leaders. Interest only peaks when a change of government is in the...