A colourful year in power for Boris Johnson

Boris Johnson begins work in his office at City Hall. Photograph: Stefan Rousseau/PA

Boris Johnson playing tennis with Serbian tennis star Novak Djokavic. Photograph: Martin Godwin/Guardian

Boris Johnson joins revellers in the Pride London parade. Photograph: Anthony Devlin/PA

Boris Johnson plays table tennis at Brixton Road youth centre. Photograph: Lewis Whyld/PA

Metropolitan police commissioner Sir Ian Blair delivered a stinging parting shot to Boris Johnson before stepping down. Photograph: Tim Ireland/PA

Boris Johnson congratulates the new Metropolitan police commissioner, Sir Paul Stephenson, after his appointment was announced by home secretary Jacqui Smith Photograph: Ian Nicholson/PA

Boris Johnson meets British Transport police at Finsbury Park Underground Station. Photograph: Stefan Rousseau/PA

Boris Johnson launches London's climate change adaptation strategy. Photograph: Martin Godwin/Guardian

Boris Johnson unveils the new air-conditioned carriages that will be used on the London Underground. Photograph: Frank Baron/Guardian

Boris Johnson giving his speech during the Conservative party conference in Birmingham, England. Photograph: Martin Argles/Guardian

Boris Johnson chairs a meeting of the Metropolitan Police Authority at City Hall in London. Photograph: Sang Tan/AP

Boris Johnson and wife Marina arrive at the GQ Men Of The Year Awards, at the Royal Opera House Photograph: Dave M Benett/Getty

Boris Johnson opens the Westfield Centre, London's largest shopping mall. Photograph: Martin Argles/Guardian

Boris Johnson adjusts his tie as he sits on an underground train at High Street Kensington tube station. Photograph: Dylan Martinez/Reuters

Boris Johnson at a December 2008 news conference in central London. Photograph: Toby Melville/Reuters

Boris Johnson attends a fire safety training day at Dagenham fire station. Photograph: Shaun Curry/AFP

Boris Johnson meets the Queen during the Beijing Olympics Team GB reception at Buckingham Palace. Photograph: Stefan Rousseau/PA

Boris Johnson at the handover of the Olympic flag with Gordon Brown, David Beckham and Tessa Jowell. Photograph: Paula Bronstein/Getty

Boris Johnson gets out of a rickshaw as he arrives at London House at Houhai lake in Beijing, ahead of the handover to London at the closing ceremony of the Beijing Olympics. Photograph: Dan Chung/Guardian

IOC president Jacques Rogge hands Boris Johnson the Olympic flag during the handover to London for the 2012 Olympic games at the closing ceremony of the Beijing 2008 Olympic Games. Photograph: Nic Bothma/EPA

Boris Johnson makes a phone call. Photograph: Frank Baron/Guardian

Boris Johnson announces a design competition for a new London Routemaster bus at the London Transport Museum. Photograph: Cate Gillon/Getty

Boris Johnson talks to a homeless man while visiting a homeless charity shelter in Shepherds Bush, London. Photograph: Martin Argles/Guardian

Boris Johnson stands in front of rubbish at Bywaters recycling plant, Bromley by Bow, east London. Photograph: Andy Aitchison/Corbis

Conservative party leader David Cameron congratulates Boris Johnson on becoming London mayor. Photograph: Stefan Rousseau/PA

Boris Johnson goes out for a run in London while awaiting the results of the London mayoral election. Photograph: Dominic Lipinski/PA

Tory candidate for London mayor, Boris Johnson, speaks to shoppers in Richmond, ahead of the London mayoral and assembly elections. Photograph: Stefan Rousseau/PA