David Cameron's big day

David Cameron gestures to his driver as he prepares to leave his house in London Photograph: Sang Tan/AP Photograph: Sang Tan/guardian.co.uk Cameron makes his way to his office in the House of Commons Photograph: Stefan Rousseau/PA Photograph: Stefan Rousseau/guardian.co.uk A car carrying Cameron and his wife Samantha arrives at 10 Downing Street Photograph: Sang Tan/AP Photograph: Sang Tan/guardian.co.uk The Queen greets Cameron at Buckingham Palace in an audience to invite him to be the next prime minister Photograph: Getty Images Photograph: guardian.co.uk The official Buckingham Palace document announcing the Queen's request for Cameron to form a new administration Photograph: Getty Images Photograph: guardian.co.uk Cameron and his wife exit Buckingham Palace after the audience with the Queen Photograph: Andy Rain/EPA Photograph: Andy Rain/guardian.co.uk Barack Obama calls to congratulate Cameron from the White House Photograph: Getty Images Photograph: guardian.co.uk Samantha Cameron (right) arrives at the Portcullis House annex of the Houses of Parliament Photograph: Paul Hackett/Reuters Photograph: Paul Hackett/guardian.co.uk Mr and Mrs Cameron arrive at No 10 Photograph: Lewis Whyld/PA Photograph: Lewis Whyld/guardian.co.uk Mr and Mrs Cameron at No 10 Photograph: Dan Chung/Guardian Photograph: Dan Chung/guardian.co.uk Mr and Mrs Cameron outside the door to No 10 Photograph: Graeme Robertson/Guardian Photograph: Graeme Robertson/guardian.co.uk Mr and Mrs Cameron enter No 10 Photograph: Stefan Rousseau/AP Photograph: Stefan Rousseau/guardian.co.uk Mr and Mrs Cameron inside No 10 after Mr Cameron's meeting with the Queen Photograph: Getty Images Photograph: guardian.co.uk Mr and Mrs Cameron inside No 10 Photograph: Getty Images Photograph: guardian.co.uk Mr and Mrs Cameron meet the cabinet secretary, Gus O'Donnell Photograph: Reuters Photograph: guardian.co.uk Mr and Mrs Cameron leave No 10 Photograph: Ben Stansall/AFP/Getty Images Photograph: Ben Stansall/guardian.co.uk