Gordon Brown begins his campaign for leadership of the Labour party

Gordon Brown arrives at the Imagination Gallery, where he made the opening speech of his Labour Party leadership campaign Photograph: Bruno Vincent/Getty

Gordon Brown enters the Imagination Gallery Photograph: Martin Argles/Guardian

Gordon Brown amongst the crowd of Labour party supporters Photograph: Martin Argles/Guardian

Gordon Brown is obscured by a screen during the opening speech of his Labour Party leadership campaign Photograph: Martin Argles/Guardian

Gordon Brown delivers a statement at The Imagination Gallery Photograph: Andrew Parsons/PA

Gordon Brown drinks some water Photograph: Lefteris Pitarakis/AP

Gordon Brown with young Labour party supporters Photograph: Martin Argles/Guardian

A large banner at the Imagination Gallery in London, where Gordon Brown made the opening speech of his Labour party leadership campaign Photograph: Martin Argles/Guardian

Gordon Brown after launching his Labour party leadership campaign Photograph: Andrew Parsons/PA

Gordon Brown kisses his wife Sarah Photograph: Stephen Hird/Reuters

Gordon Brown leaves The Imagination Gallery Photograph: Andrew Parsons/PA

Gordon Brown meets local Labout party supporters in Knebworth Photograph: Martin Argles/Guardian

Labour party supporters listen to the chancellor Photograph: Martin Godwin/freelance

Gordon Brown arrives at Knebworth to address more Labour party supporters Photograph: Martin Godwin/freelance

Gordon Brown kissed Barbara Follet Photograph: Martin Argles/Guardian