Mop or broom? Boris Johnson's witty speech will feed rumours of a rivalry

The London mayor Boris Johnson got a raucous reception at the Tory conference today feeding the rumours that he could be positioning himself as the next party leader.

He described David Cameron as a broom - apparently a riposte to being called a mop - but the Prime Minister appeared to take it on the chin.

ITV News Political Editor Tom Bradby reports: