Conservative Party leadership contender Jeremy Hunt leaves Lancaster House, London. Britain will learn who its next prime minister will be on Tuesday as the result of a Tory leadership contest dominated by Boris Johnson is announced. Mr Johnson is clear favourite to take the crown over his run-off rival, Foreign Secretary Jeremy Hunt. A Johnson victory could spark more Government resignations. Ministers opposed to his “do or die” pledge to pull the UK out of the EU on October 31, even if there is no deal in place, could exit before Theresa May formally gives up the premiership on Wednesday afternoon.