Boris Johnson ‘would take on PM job’

London mayor Boris Johnson has admitted that he would like to be prime minister but insisted “it’s not going to happen”.

The politician, 48, who has been seen as a possible future rival to David Cameron, said he would want to “have a crack” at the job “if the ball came loose from the back of a scrum”.

He was asked whether he harboured ambitions for the job in a forthcoming BBC2 documentary.

Michael Cockerell, who made the programme, said Mr Johnson answered: “I would like to be the lead singer of an international rock group. That was my aim, or a good guitarist. I would love to have been a world-famous painter or a composer. There are many things that I would like to have been able to do.”