Conservative Party candidate Boris Johnson (R) is congratulated by Labour Party candidate Ken Livingstone after Johnson won the London Mayoral election at City Hall in central London in this May 3, 2008 file photo. Instantly recognisable thanks to his messy mop of platinum blond hair, the mayor of London has perfected a personal brand based on a comic talent and a likeable, shambolic style that conceal a hard core of self-belief and ambition. In 2008 he was elected mayor with the biggest personal mandate in British history. If he wins a second term on May 3, the London Olympics this summer will provide a global stage for this natural showman, whose humour has helped him to shrug off blunders and scandals that would have ended many careers. To match story BRITAIN-BORIS/ REUTERS/Toby Melville/Files (BRITAIN - Tags: POLITICS ELECTIONS PROFILE)