By Felix Armstrong If the polls are to be believed, the UK could get a new Prime Minister with Sir Keir Starmer taking the keys to Downing Street. But whoever becomes the Prime Minister will have a packed schedule from minute one, with priorities including selecting a cabinet and setting the tone for the new government. With vote counts not starting until the polls close at 10pm tomorrow, the picture is unlikely to become clear until Friday morning, though key early results will begin to spell out whether Labour is headed for its forecast landslide. There will, however, be an exit poll release…