Boris Johnson to seek re-election as London mayor

Mr Johnson said he had 'more to do' making the capital a better place and overseeing the Olympics.

He told LBC radio's Nick Ferrari show: "It is my intention and indeed I have written to seek the nomination to serve as Mayor for another term.

"I have got tough challenges on crime, improving the urban environment. I do think it is a good record so far and I am proud to defend it."

He could come up against either former mayor Ken Livingstone or ex-MP Oona King.

Labour will decide its candidate for the role later this month.