The Labour leadership contest has been thrown wide open by Ed Miliband's resignation - but one Labour MP whom many had tipped as a potential successor has announced that he will not be standing.

Dan Jarvis, the MP for Barnsley Central and former major in the Parachute Regiment, has ruled himself out of the race for family reasons.

Mr Jarvis lost his first wife to cancer in 2011 and he said it was "not the right time" for his family to "lose their dad" as they would if he became party leader.

He said Labour needed to renew itself after its heavy defeat in last week's general election, adding:

Image source, Labour Party

Chris Mason
Political Correspondent

The prime minister wants to renegotiate the UK's relationship with the EU - and has spoken to some of his European counterparts about this since the election. He will tell the 1922 Committee of backbench Conservative MPs this morning that aims to get a better deal for the British people. The committee chairman, Graham Brady, has said that during the referendum campaign there would be very different views amongst ministers - and they should be able to express them openly.

Image source, Getty Images

In other election news, former Respect MP George Galloway has announced he has started legal proceedings to challenge his general election defeat. Mr Galloway lost his Bradford West seat to Labour's Naz Shah, who he has alleged made "false statements" during the campaign to affect the result. He also claimed "widespread malpractice" involving postal voting meant the result must be "set aside". A Labour spokesman said the action was "pathetic and without any foundation". More here.

Chris Mason
Political Correspondent

The debate within the Conservative Party and beyond it about our place in Europe - inside the EU or outside - will be a staple of British politics for the next few years. The Tories have promised a referendum by the end of 2017. The fact that this can now happen will undoubtedly cheer many Conservatives - and voters. But David Cameron's big challenge will be managing that debate, and ensuring it doesn't become so all-consuming as to drown out everything else the government is doing.

Image source, Getty Images

David Cameron is also to address Conservative MPs at Westminster this morning for the first time since his party won an outright majority in last week's general election. The PM is expected to say that his government's task will be "to renew a sense of fairness in our society", and he will also pledge that a renewal of "our relationship with Europe" will be a priority.

The election might be done and dusted, but your faithful Politics Live team - Pippa Simm and Victoria King - is still here. We'll keep you informed as David Cameron builds his first all-Conservative cabinet, and bring you any news of more runners in the Labour, Lib Dem or UKIP leadership races.