In pictures: Gordon Brown's last hours in Downing Street

Gordon Brown with ministers, waiting for the call from Nick Clegg

The Guardian had exclusive access to 10 Downing Street during Gordon Brown's final moments as prime minister on 11 May. Ministers joked quietly, said photographer Martin Argles, while waiting for a call from Lib Dem Nick Clegg about a possible coalition.

Mr Argles said it was very tense. When the call came - five days after the general election resulted in a hung parliament - silence fell in the room. Mr Brown was heard telling Mr Clegg that he could "not hold on any longer", and had to go to the Palace.

Gordon Brown writes letters to his successors, as ministers and Alastair Campbell look on.

Mr Brown wrote letters to his successors as Douglas Alexander (left) and Ed Balls (right), soon to lose their ministerial jobs, looked on with adviser Alastair Campbell (seated).

Sarah Brown, Gordon Brown and their children surrounded by Downing Street staff.

Mr Brown's wife Sarah and his sons John and Fraser entered the office as staff applauded the outgoing prime minister.

A box of framed photos and other belongings was packed as the end of Labour rule neared. Mr Argles said it was "a once in a lifetime opportunity to get inside an actual moment of government change, and really, really dramatic".