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LONDON, ENGLAND - APRIL 14: Mayor of London Boris Johnson takes part in Mayoral hustings on April 14. 2012 in London, England. The hustings, organised by gay rights charity Stonewall, were held at the BFI Southbank ahead of London's mayoral elections on May 3, 2012. (Photo by Oli Scarff/Getty Images)

LONDON, ENGLAND - APRIL 14:  Mayor of London Boris Johnson takes part in Mayoral hustings on April 14. 2012 in London, England. The hustings, organised by gay rights charity Stonewall, were held at the BFI Southbank ahead of London's mayoral elections on May 3, 2012.  (Photo by Oli Scarff/Getty Images)