London mayor Khan challenges Labour leader to deliver election win

By William James LONDON (Reuters) - Pro-business London mayor Sadiq Khan one of the Labour Party's most powerful figures, heaped pressure on his socialist leader Jeremy Corbyn to deliver an election win, using a speech on Tuesday to stress the importance of being in office. Khan became Labour's most senior elected official in May, beating a candidate from the ruling Conservatives to win a huge mandate over London's 17 billion pound budget which covers areas like business policy, housing, policin