The race to become London's mayor

City workers and tourists pass City Hall, the destination for the winner of the London mayoral elections Photograph: Cate Gillon/Getty

April 22: Tory candidate Boris Johnson holds a punchbag on a visit to the London Boxing Academy community project in Tottenham Photograph: Clive Gee /PA

April 29: Boris Johnson tries his hand at basketball with a sports class at Stockwell Park high school Photograph: Daniel Berehulak/Getty

April 29: Ken aka Knckana Cailin is one of the dogs renamed after Mayoral candidates for a race at Wimbledon Greyhound Stadium Photograph: Sue Moore/PA

April 29: David Cameron and Boris Johnson canvass for votes by phone at Conservative Party call centre Photograph: Daniel Berehulak/Getty

April 30: Ken Livingstone enjoys a cup of tea and a bacon sandwich while being interviewed at Ken's Cafe in West Ham Photograph: Cate Gillon/Getty

April 30: Boris Johnson rides on the platform of a Routemaster bus during a campaign visit to north London Photograph: Sang Tan /AP

April 30: Ken Livingstone on the tube on the final day of campaigning Photograph: Leon Neal/AFP

May 1: Boris Johnson does some last minute canvassing on London Bridge Photograph: Shaun Curry /AFP

May 1: Liberal Democrat candidate Brian Paddick speaks to voting staff at Vauxhall primary school after casting his vote Photograph: Clive Gee/PA

May 1: Prime minister Gordon Brown and his wife Sarah leave the Methodist Central Hall polling station in central London after casting their vote Photograph: Shaun Curry /AFP

May 1: Conservative leader David Cameron and wife, Samantha, arrive to cast their vote in North Kensington Photograph: Dan Kitwood/Getty

May 1: Ken Livingstone arrives at a polling station near his home in Cricklewood, north west London Photograph: Martin Argles/Guardian