Susan Hall was on Wednesday unveiled as the Tory candidate who will challenge Sadiq Khan in next year’s London mayoral elections.Ms Hall, a London Assembly member and former council leader, defeated Moz Hossain KC, a criminal barrister and political novice, in the ballot of about 20,000 London Tory members.The result was announced at the Battle of Britain Bunker in Uxbridge by Tory party chairman Greg Hands in front of MPs and supporters.Ms Hall won by securing 57 per cent of the votes cast to 43 per cent for Mr Hossain. The precise number of votes cast was not disclosed. She vowed to “do whatever it takes to win” and received a huge round of applause when she vowed to stop the Ulez expansion “on day one” if she becomes mayor.