Image source, AFP/Getty Images

Former England footballer Sol Campbell has confirmed his intention to become the next mayor of London.

The ex-Arsenal and Tottenham Hotspur defender said he could challenge for the Conservative nomination. He said he wanted to "change London for everybody" but acknowledged he would not be a "frontrunner".

Campbell, 40, will take part in a hustings event with other candidates for the Tory nomination on 4 July.

David Cameron will be speaking at the G7 summit from about 14:30 BST. It comes as Downing Street denies the PM gave ministers an ultimatum to back him in the upcoming EU referendum or resign.We'll bring you the key lines from his speech as it unfolds.

Also in half an hour, MPs begin their business for the week, starting with an hour-long questioning of defence ministers followed by a general debate on the aims and principles of the Scotland Bill, which promises revenue-raising powers for the Scottish Parliament.

James Landale
Deputy political editor

Image source, Getty Images

What is it about the Conservative Party and the European Union? What is it that prompts such passion, such muddle and - on occasion - such bitterness?

The relationship between Britain and the EU tore the Conservatives apart for years in government and in opposition.

David Cameron was elected leader 10 years ago on a promise to stop his party banging on about Europe. A decade on the prime minister has got his drum sticks out and is banging his way around Europe. But not all his party is marching to his beat.

Read more from James here.

The Spectator's Alex Massie predicts, external that the EU referendum "will all end badly", for David Cameron, his reputation and his place in history.

He foresees the party splitting over the issue, with defections to UKIP and the Conservatives ending up as a minority government.

The World at One
BBC Radio 4

Image source, Conservative Party

Tory MP Nadhim Zahawi says he and other backbenchers should be free to campaign on either side during the Europe referendum, acknowledging the reality that some of his colleagues "don't see the point" of being part of the European Union. Asked about the position of ministers, he says that should be "up to the government and the cabinet". It will be the public who will decide the outcome not politicians, he adds, saying the "buck stops with them". 

The World at One
BBC Radio 4

Tom Pursglove, MP for Corby, tells the World at One: "If we don't get back to free trade and a common market, I will vote to leave."

Conservative MP David Davis says he thinks the Downing Street change over the restrictions on ministers during the EU referendum may have been prompted by the anger expressed by the party's MPs:

Image source, PA

Downing Street has denied that David Cameron has ordered his ministers to back him in the EU referendum or leave the government.

The PM had told journalists everyone in government had "signed up" to his plans as set out in the Tory manifesto.

This led to criticism from some Conservative MPs, who said ministers should be free to vote as they wish.

But Mr Cameron's spokeswoman said reporters at the G7 Summit in Germany had "over interpreted his remarks".

The full story can be found here.

Human rights activist Peter Tatchell has been talking about Lib Dem leadership hopeful Tim Farron's comments to the Sunday Politics yesterday. 

On the programme, Mr Farron had defended his record on equality and abortion laws. In answering, he said Mr Tatchell had been on the same side as him.

Mr Farron has now apologised if he "misremembered" Mr Tatchell's position.

The Daily Politics

UKIP's Mark Reckless says of the EU referendum: "UKIP want to be part of that out campaign - we don't want to dominate."

He believes that UKIP leader Nigel Farage "should have an important role in that" but that the party wants to bring "as many people as possible into what we hope will be a successful campaign". 

Asked who should lead the 'out' campaign, he said he did not yet know. 

The Daily Politics

Tory MEP David Campbell Bannerman, a member of the newly-formed Conservatives for Britain, says he is "right behind" the government and "right behind" the prime minister. He says talk of forced resignations is "premature" as "we will have to see what renegotiation brings". 

However, he says it "would be better and healthier for ministers" to have a free vote but that he supports cabinet responsibility during the renegotiation process. Conservatives for Britain would lead the campaign for Britain to quit the EU if David Cameron fails to secure radical reforms. 

Image source, Reuters

Wikipedia has censured the administrator who accused Conservative MP Grant Shapps of editing his own entry on the website and that of Cabinet ministers.

In April, an administrator known as "Chase me ladies, I'm the Cavalry" told the Guardian that Wikipedia had barred a user called "Contribsx" because the account had been used to make changes to Mr Shapps' profile.

The administrator told the paper they believed the account was "either run by Shapps directly" or by someone else "but under his clear direction".

Wikipedia's arbitration and audit committees have concluded there "does not appear to be a major breach of policy" but the administrator gave the appearance that Wikipedia's monitoring tools were being used to  "exert political or social control".

It was also found that the administrator was "unable to provide sufficient justification" for using the monitoring tools, and "did not take adequate steps" before making the information public to make sure that the release of the information was "seen as neutral and unbiased".

Mr Shapps consistently denied the allegations made by "Chase me ladies", describing them as "categorically false and defamatory".

The Daily Politics

But Mr Hosie said that Mr Stewart's view was "completely wrong". 

"This does not give us a powerhouse parliament," he said. "These are very modest measures."

The Daily Politics

The SNP's Stewart Hosie and Conservative Iain Stewart are discussing the Scotland Bill on the Daily Politics this lunchtime. 

Mr Stewart says that "the proposals in the Scotland Bill would make the Scottish parliament one of the most powerful devolved parliaments anywhere in the world". 

Scotland would "control a significant proportion of its own revenues" and that "if it wishes to increase its own spending, it would have the powers to do that".

Asked if it would implement the proposals of the Smith commission, he says yes. 

Members of the cabinet should be given a free vote on whether the UK should stay in the EU if the prime minister's attempt to repatriate powers "fall short", former minister Henry Bellingham has said.

The Tory MP for North West Norfolk says if David Cameron achieves little more than "window dressing" or a "face-saving package", ministers should be free to vote according to their conscience. 

"It is after all going to be a free vote for MPs in the House," he said. "It should be a free vote for ministers as well."