Boris Johnson: 'I want a better deal for the people of this country'

Boris Johnson has said that he will join the campaign for Britain to leave the European Union.

London's mayor put an end to months of speculation, saying that David Cameron's re-negotiation had failed to deliver fundamental change in Britain's relationship with Brussels.

He made the announcement made outside his Islington home in what will be a huge boost for the "out" campaign.

It potentially gives them a popular figurehead able to connect with voters.