Labour Party leadership candidates (R-L) Liz Kendall, Jeremy Corbyn, Yvette Cooper and Andy Burnham participate in a leadership debate hosted by The Guardian newspaper in central London, Britain August 27, 2015. Britain's opposition Labour Party is voting for a new leader in a contest that polls indicate will be won by Jeremy Corbyn, a veteran fan of Karl Marx who has upstaged rivals by promising a radical shift back to the party's socialist roots. REUTERS/Peter Nicholls 

An event organiser carries boxes for audience questions to be submitted ahead of a Labour Party leadership debate between candidates pictured on the boxes, (L-R) Yvette Cooper, Andy Burnham, Liz Kendall and Jeremy Corbyn, at a hustings event hosted by The Guardian newspaper in central London, Britain August 27, 2015. Britain's opposition Labour Party is voting for a new leader in a contest that polls indicate will be won by Jeremy Corbyn, a veteran fan of Karl Marx who has upstaged rivals by promising a radical shift back to the party's socialist roots. REUTERS/Peter Nicholls 

Labour Party leadership candidates Yvette Cooper (R) and Andy Burnham (L) take part in a leadership debate hosted by The Guardian newspaper in central London, Britain August 27, 2015. Britain's opposition Labour Party is voting for a new leader in a contest that polls indicate will be won by Jeremy Corbyn, a veteran fan of Karl Marx who has upstaged rivals by promising a radical shift back to the party's socialist roots. REUTERS/Peter Nicholls 

Labour Party leadership candidates Liz Kendall (L), Jeremy Corbyn (2nd L), Yvette Cooper (C) and Andy Burnham (2nd R) take part in a leadership debate hosted by Hugh Muir (R) of The Guardian newspaper in central London, Britain August 27, 2015. Britain's opposition Labour Party is voting for a new leader in a contest that polls indicate will be won by Jeremy Corbyn, a veteran fan of Karl Marx who has upstaged rivals by promising a radical shift back to the party's socialist roots. REUTERS/Peter Nicholls 

Labour Party leadership candidates Liz Kendall (L), Jeremy Corbyn (2nd L) and Yvette Cooper (2nd R) listen as rival candidate Andy Burnham (R) speaks at a leadership debate hosted by The Guardian newspaper in central London, Britain August 27, 2015. Britain's opposition Labour Party is voting for a new leader in a contest that polls indicate will be won by Jeremy Corbyn, a veteran fan of Karl Marx who has upstaged rivals by promising a radical shift back to the party's socialist roots. REUTERS/Peter Nicholls 

Labour Party leadership candidates Liz Kendall (L), Jeremy Corbyn (2nd L) and Yvette Cooper (2nd R) listen as rival candidate Andy Burnham (R) speaks at a leadership debate hosted by The Guardian newspaper in central London, Britain August 27, 2015. Britain's opposition Labour Party is voting for a new leader in a contest that polls indicate will be won by Jeremy Corbyn, a veteran fan of Karl Marx who has upstaged rivals by promising a radical shift back to the party's socialist roots. REUTERS/Peter Nicholls TPX IMAGES OF THE DAY

Labour Party leadership candidates Liz Kendall (L), Jeremy Corbyn (2nd L) and Yvette Cooper (2nd R) listen as rival candidate Andy Burnham (R) speaks at a leadership debate hosted by The Guardian newspaper in central London, Britain August 27, 2015. Britain's opposition Labour Party is voting for a new leader in a contest that polls indicate will be won by Jeremy Corbyn, a veteran fan of Karl Marx who has upstaged rivals by promising a radical shift back to the party's socialist roots. REUTERS/Peter Nicholls 

Labour Party leadership candidate Andy Burnham speaks to supporters in Edinburgh, Scotland, Britain August 26, 2015. Britain's opposition Labor Party is voting for a new leader in a contest that polls indicate will be won by Jeremy Corbyn, a veteran fan of Karl Marx who has upstaged rivals by promising a radical shift back to the party's socialist roots. REUTERS/Russell Cheyne

Labour Party leadership candidate Andy Burnham prepares to speak to supporters in Edinburgh, Scotland, Britain August 26, 2015. Britain's opposition Labor Party is voting for a new leader in a contest that polls indicate will be won by Jeremy Corbyn, a veteran fan of Karl Marx who has upstaged rivals by promising a radical shift back to the party's socialist roots. REUTERS/Russell Cheyne

Labour Party leadership candidate Andy Burnham writes notes as he speaks to supporters in Edinburgh, Scotland, Britain August 26, 2015. Britain's opposition Labor Party is voting for a new leader in a contest that polls indicate will be won by Jeremy Corbyn, a veteran fan of Karl Marx who has upstaged rivals by promising a radical shift back to the party's socialist roots. REUTERS/Russell Cheyne

Labour Party leadership candidate Andy Burnham listens to a question from supporters in Edinburgh, Scotland, Britain August 26, 2015. Britain's opposition Labor Party is voting for a new leader in a contest that polls indicate will be won by Jeremy Corbyn, a veteran fan of Karl Marx who has upstaged rivals by promising a radical shift back to the party's socialist roots. REUTERS/Russell Cheyne

Labour Party leadership candidate Andy Burnham speaks to supporters in Edinburgh, Scotland, Britain August 26, 2015. Britain's opposition Labor Party is voting for a new leader in a contest that polls indicate will be won by Jeremy Corbyn, a veteran fan of Karl Marx who has upstaged rivals by promising a radical shift back to the party's socialist roots. REUTERS/Russell Cheyne

Labour Party leadership candidate Andy Burnham arrives to speak to supporters in Edinburgh, Scotland, Britain August 26, 2015. Britain's opposition Labor Party is voting for a new leader in a contest that polls indicate will be won by Jeremy Corbyn, a veteran fan of Karl Marx who has upstaged rivals by promising a radical shift back to the party's socialist roots. REUTERS/Russell Cheyne

Labour Party leadership candidate Andy Burnham arrives to speak to supporters in Edinburgh, Scotland, Britain August 26, 2015. Britain's opposition Labor Party is voting for a new leader in a contest that polls indicate will be won by Jeremy Corbyn, a veteran fan of Karl Marx who has upstaged rivals by promising a radical shift back to the party's socialist roots. REUTERS/Russell Cheyne

Candidate Yvette Cooper (L) shakes hands with fellow candidate Andy Burnham after a Labour Party leadership hustings event in Stevenage, Britain June 20, 2015. REUTERS/Darren Staples 

Labour Party leadership candidates Jeremy Corbyn (C) and Andy Burnham (R) embrace as Yvette Cooper walks off stage after a hustings event in Stevenage, Britain June 20, 2015. REUTERS/Darren Staples 

Labour Party leadership candidate Andy Burnham speaks as fellow candidate Yvett Cooper listens during a hustings event in Stevenage, Britain June 20, 2015. REUTERS/Darren Staples 

Labour Party leadership candidate Andy Burnham speaks during a hustings event in Stevenage, Britain June 20, 2015. REUTERS/Darren Staples 

Labour Party leadership candidates Jeremy Corbyn, Liz Kendall, Yvette Cooper and Andy Burnham (L-R) take their seats for a hustings event in Stevenage, Britain June 20, 2015. REUTERS/Darren Staples 

Labour Party leadership candidates Jeremy Corbyn, Liz Kendall, Yvette Cooper and Andy Burnham (L-R) take their seats for a hustings event in Stevenage, Britain June 20, 2015. REUTERS/Darren Staples 

Labour Party leadership contender Andy Burnham escorts children during the State Opening of Parliament at the Palace of Westminster in London, Britain May 27, 2015. REUTERS/Ian Vogler/pool

Prospective Labour leader Andy Burnham attends the annual conference of independent organisations for Labour Party members and trade unionists, London, May 16, 2015. REUTERS/Paul Hackett

Prospective Labour leaders (L-R) Andy Burnham,Yvette Cooper, Mary Creagh, Tristram Hunt and Liz Kendall appear at the annual conference of independent organisation for Labour Party members and trade unionists, London, May 16, 2015. REUTERS/Paul Hackett

Prospective Labour leaders Andy Burnham arrives at the annual conference of independent organisations for Labour Party members and trade unionists, London, May 16, 2015. REUTERS/Paul Hackett

Prospective Labour leaders Andy Burnham and Yvette Cooper appear at the annual conference of an independent organisations for Labour Party members and trade unionists, London, May 16, 2015. REUTERS/Paul Hackett

Prospective Labour leaders (L-R) Andy Burnham,Yvette Cooper, Mary Creagh, Tristram Hunt and Liz Kendall appear at the annual conference of an independent organisation for Labour Party members and trade unionists, London, May 16, 2015. REUTERS/Paul Hackett

Prospective Labour leaders (L-R) Andy Burnham,Yvette Cooper, Mary Creagh, Tristram Hunt and Liz Kendall appear at the annual conference of an independent organisation for Labour Party members and trade unionists, London, May 16, 2015. REUTERS/Paul Hackett

Prospective Labour leaders (L-R) Andy Burnham,Yvette Cooper, Mary Creagh, Tristram Hunt and Liz Kendall appear at the annual conference of an independent organisation for Labour Party members and trade unionists, London, May 16, 2015. REUTERS/Paul Hackett

Prospective Labour leaders (L-R) Andy Burnham,Yvette Cooper, Mary Creagh, Tristram Hunt and Liz Kendall appear at the annual conference of an independent organisation for Labour Party members and trade unionists, London, Britain, May 16, 2015. REUTERS/Paul Hackett

Britain's opposition Labour Party's Shadow Chancellor Ed Balls (C) gestures during a campaign event with Labour Shadow Health Secretary Andy Burnham (R) and Labour Shadow Secretary for Care and Older People Liz Kendall in London April 20, 2015. REUTERS/Suzanne Plunkett 

A child holds up a drinking cup as Britain's opposition Labour Party's Shadow Chancellor Ed Balls (2nd L) gestures during a campaign event with Labour Shadow Health Secretary Andy Burnham (C) and Labour Shadow Secretary for Care and Older People Liz Kendall in London April 20, 2015. REUTERS/Suzanne Plunkett 

Britain's opposition Labour Party's Shadow Chancellor Ed Balls (L) leaves a campaign event with Labour Shadow Health Secretary Andy Burnham in London April 20, 2015. REUTERS/Suzanne Plunkett 

Britain's opposition Labour Party's Shadow Chancellor Ed Balls (C) gestures during a campaign event with Labour Shadow Health Secretary Andy Burnham (R) and Labour Shadow Secretary for Care and Older People Liz Kendall in London April 20, 2015. REUTERS/Suzanne Plunkett 

Britain's opposition Labour party's shadow health secretary Andy Burnham (R) embraces Labour supporter Harry Smith after he gave an emotionally charged speech at the party's conference in Manchester, September 24, 2014. REUTERS/Suzanne Plunkett (BRITAIN - Tags: POLITICS)

Britain's opposition Labour party's shadow health secretary Andy Burnham speaks at the party's conference in Manchester, September 24, 2014. REUTERS/Suzanne Plunkett (BRITAIN - Tags: POLITICS)

Britain's opposition Labour party's shadow health secretary Andy Burnham speaks at the party's conference in Manchester, September 24, 2014. REUTERS/Suzanne Plunkett (BRITAIN - Tags: POLITICS)

Britain's opposition Labour party's shadow health secretary Andy Burnham listens to speeches at the party's conference in Manchester, September 24, 2014. REUTERS/Suzanne Plunkett (BRITAIN - Tags: POLITICS)

Britain's shadow health secretary Andy Burnham reacts as he gets out of a racing car simulator during the Labour Party's annual conference in Manchester, northern England September 22, 2014. REUTERS/Darren Staples (BRITAIN - Tags: POLITICS) 

Britain's shadow Health Secretary Andy Burnham drives a racing car simulator during the Labour Party's annual conference in Manchester, northern England September 22, 2014. REUTERS/Darren Staples (BRITAIN - Tags: POLITICS) 

Britain's shadow Chancellor Ed Balls (L), shadow Health Secretary Andy Burnham and shadow Home Secretary Yvette Cooper (R) clap and sing during a rendition of the 'Red Flag' at the close of the Labour party's annual conference in Brighton, Southern England September 25, 2013. REUTERS/Luke MacGregor (BRITAIN - Tags: POLITICS) 

Delegates applaud after a speech by Britain's shadow Health Secretary Andy Burnham at the annual Labour party conference in Brighton, southern England September 25, 2013. REUTERS/Stefan Wermuth (BRITAIN - Tags: POLITICS HEALTH) 

Britain's shadow Health Secretary Andy Burnham delivers a speech during the annual Labour party conference in Brighton, southern England September 25, 2013. REUTERS/Stefan Wermuth (BRITAIN - Tags: POLITICS) 

(L-R) Shadow Health Secretary Andy Burnham, comedian Eddie Izzard and Alastair Campbell, who worked as Communications Director for former Labour Prime Minister Tony Blair react after a run during the annual Labour Party Conference in Brighton, southern England September 23, 2013. REUTERS/Stefan Wermuth (BRITAIN - Tags: POLITICS SPORT ATHLETICS) 

Britain's shadow health secretary Andy Burnham (L) plays soccer during the Labour Party versus the media soccer match in Lancing, ahead of Labour's annual conference in Brighton, in southern England September 22, 2013. REUTERS/Luke MacGregor (BRITAIN - Tags: POLITICS SPORT SOCCER) 

Britain's shadow chancellor Ed Balls (L) and shadow health secretary Andy Burnham laugh after the Labour Party versus the media soccer match in Lancing, ahead of Labour's annual conference in Brighton, in southern England September 22, 2013. REUTERS/Luke MacGregor (BRITAIN - Tags: POLITICS SPORT SOCCER) 

Britain's shadow chancellor Ed Balls (3rd R) and shadow health secretary Andy Burnham (2nd R) walk onto the pitch to play soccer during the Labour Party versus the media soccer match in Lancing, ahead of Labour's annual conference in Brighton, in southern England September 22, 2013. REUTERS/Luke MacGregor (BRITAIN - Tags: POLITICS SPORT SOCCER) 

Britain's Shadow Chancellor Ed Balls (L) is congratulated by Shadow Health Secretary Andy Burnham after scoring a goal during the Labour Party versus the media soccer match ahead of their party's annual conference in Manchester, northern England September 30, 2012. REUTERS/Andrew Winning (BRITAIN - Tags: SPORT SOCCER POLITICS) 

Britain's Shadow Chancellor Ed Balls (L) is congratulated by Shadow Health Secretary Andy Burnham after scoring a goal during the Labour Party versus the media soccer match ahead of their party's annual conference in Manchester, northern England September 30, 2012. REUTERS/Andrew Winning (BRITAIN - Tags: SPORT SOCCER POLITICS) 

British MP Andy Burnham celebrates after scoring during the Labour Party versus the media soccer match ahead of his party's annual conference in Manchester, northern England, September 30, 2012. REUTERS/Phil Noble (BRITAIN - Tags: POLITICS SOCIETY SPORT SOCCER) 

Britain's shadow chancellor Ed Balls (R) and MP Andy Burnham take a drink during the Labour Party versus the media soccer match ahead of their party's annual conference in Manchester, northern England, September 30, 2012. REUTERS/Phil Noble (BRITAIN - Tags: SPORT SOCCER POLITICS) 

Shadow Education Secretary Andy Burnham delivers his keynote speech on the fourth day of Britain's opposition Labour Party's annual conference, in Liverpool, northern England September 28, 2011. REUTERS/Phil Noble (BRITAIN - Tags: POLITICS EDUCATION) 

Britain's opposition Labour Party leader Ed Miliband holds his first shadow cabinet meeting at the House of Commons, in London October 12, 2010. (clockwise from left) Shadow Secretary of State for Wales, Peter Hain, Shadow Chief Secretary to the Treasury, Angela Eagle, Shadow Secretary for Business, Innovation and Skills, John Denham Shadow, Secretary for Education and Election coordinator, Andy Burnham, Shadow Home Secretary, Ed Balls, Shadow Chancellor, Alan Johnson, Chief Whip, Rosie Winterton, Shadow Work and Pensions, Douglas Alexander, Shadow Communities and Local Government, Caroline Flint, Shadow Transport, Maria Eagle, Baroness Royall, Leader of the EPLP (Not full member of cabinet, attending when discussing European issues) Glenis Willmott, Chair of PLP, Tony Lloyd, Shadow Environment Food and Rural Affairs Mary Creagh, Shaun Woodward, Shadow Scotland Anne McKechin, Shadow Leader of House of Commons, Hilary Benn, Shadow Health John Healey, Shadow International Development, Harriet Harman, Labour Party Leader, Ed Miliband, Shadow Foreign Secretary Yvette Cooper, Shadow Secretary for Justice Sadiq Khan, Shadow Minister for Olympics, Tessa Jowell, Shadow Defence, Jim Murphy and Shadow Minister for the Cabinet Office, Liam Byrne. REUTERS/Stefan Rousseau/Pool (BRITAIN - Tags: POLITICS) 

Former British Government Minister Andy Burnham smiles as he poses for photographers after announcing his intention to stand for the leadership of Britain's Labour party during a news conference at the peoples History Museum in Manchester, northern England, May 20 2010. REUTERS/Phil Noble (BRITAIN - Tags: PROFILE POLITICS) 

Former British Government Minister Andy Burnham smiles as he poses for photographers on old ballot boxes after announcing his intention to stand for the leadership of Britain's Labour party during a news conference at the peoples History Museum in Manchester, northern England, May 20 2010. REUTERS/Phil Noble (BRITAIN - Tags: PROFILE POLITICS) 

Former British Government Minister Andy Burnham smiles as he poses for photographers on old ballot boxes after announcing his intention to stand for the leadership of Britain's Labour party during a news conference at the peoples History Museum in Manchester, northern England, May 20 2010. REUTERS/Phil Noble (BRITAIN - Tags: PROFILE POLITICS) 

Former British government minister Andy Burnham announces his intention to stand for the leadership of Britain's Labour party during a news conference at the People's History Museum in Manchester, northern England, May 20 2010. REUTERS/Phil Noble (BRITAIN - Tags: POLITICS) 

Former British government minister Andy Burnham announces his intention to stand for the leadership of Britain's Labour party during a news conference at the People's History Museum in Manchester, northern England, May 20 2010. REUTERS/Phil Noble (BRITAIN - Tags: POLITICS) 

Former British government minister Andy Burnham announces his intention to stand for the leadership of Britain's Labour party during a news conference at the People's History Museum in Manchester, northern England, May 20 2010. REUTERS/Phil Noble (BRITAIN - Tags: POLITICS) 

Former British government minister Andy Burnham announces his intention to stand for the leadership of Britain's Labour party during a news conference at the People's History Museum in Manchester, northern England, May 20 2010. REUTERS/Phil Noble (BRITAIN - Tags: POLITICS) 

Former British government minister Andy Burnham announces his intention to stand for the leadership of Britain's Labour party during a news conference at the People's History Museum in Manchester, northern England, May 20 2010. REUTERS/Phil Noble (BRITAIN - Tags: POLITICS)