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David Cameron's Australian election strategist Lynton Crosby has said that UK voters were "betrayed" by pollsters and commentators before the election, in an interview with the Telegraph, external. He called for a ban on polls in the three weeks running up to an election.

Today Programme
BBC Radio 4

With polls prior to the election almost completely failing to predict the outcome, statistician Sir David Spiegelhalter of Cambridge University says the crucial point about polls "is whether they are any good or not?".

So what went wrong?

"It was a very bad day. Many reasons are given: there might have been a Conservative undercount. But I think the industry's got to face up to basic design problems. These polls at the moment: they're just not very good. The huge numbers of cheap and cheerful surveys done really is PR because they know the media absolutely lap them up. And they use online panels and phone surveys, they're just as bad. I don't know what you would say if someone cold-called you and asked you what you were going to vote on your phone: I think I wouldn't be very polite. 30% or fewer actually give an answer. So these are really poor initial data."

Today Programme
BBC Radio 4

The Scottish people "didn't trust the Scottish Labour Party to stand up for their voices at Westminster", Labour's sole remaning MP in Scotland Ian Murray says. "We don't restore that trust by turning in on ourselves and creating division, we need to be listening to what the Scottish people are saying, and we need to be responding to that, and we need to be regaining their trust."

BBC Radio 5 Live

Is it impossible to for Labour to appeal to voters up and down the country, given the shift to the SNP in Scotland, and UKIP and the Conservatives south of the border? Labour MP John Woodcock, the chair of Progress, tells Radio 5 live it is not:

"We didn't lose in Scotland because we were not nationalist enough, we didn't lose votes to UKIP because we were not sufficiently like UKIP, nor to the Tories because we weren't enough like the Tory party. We lost because we were weak, because people didn't understand what our vision was, or they didn't think we were capable of delivering it. If we can address that, if we look like we can reconnect with people's lives, and if we can set out a vision for the future which is both more credible but also more ambitious then I think those people who have lost faith in us and gone to other parties - we can win them back."

Ian Murray, the only Labour MP who held on to his seat in Scotland, says now is not the time to get rid of Scottish Labour leader Jim Murphy. "I don't think this is a time for the Scottish Labour Party to be dividing, I think this is a time for us all to be coming together as a Labour movement, and a Labour family under Jim's leadership taking us forward to 2016." He said Mr Murphy and his team were only put in place in December last year. "They had five months to try and turn around what has been a problem in the Scottish Labour Party for many years now."

Today Programme
BBC Radio 4

Chuka Umunna decided not to stand as Labour leader after being under a huge amount of scrutiny.Caroline Flint says she has had "a taste" of the kind of media attention which he said contributed to his decision. "It is something you have to deal with, and it's something you have to reflect on, and I've reflected long and hard about what I should do to help the Labour party... [Media attention] is not always fair... and it's not always necessarily in the public interest... I respect Chuka's decision yesterday."

Today Programme
BBC Radio 4

Labour didin't cause the financial crisis, and the framing of that argument by the Conservatives is "unfair", Labour's Caroline Flint tells the Today programme. "But the truth is we did, when the economy was growing, create a small deficit, and that is something we shouldn't do in the future. We should make sure, that... when the economy is growing, that we don't create a deficit, and we manage to balance the books."

Today Programme
BBC Radio 4

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Caroline Flint has put her name forward for deputy leader of the Labour Party. She tells the Today programme: "The important decision we make between now and 2020 is who we are going to elect as our leader and deputy leader of the Labour Party... It's about understanding why we lost this election and what we need to do to win in 2020, and that's why, at this point in time, I fell I should step up and stand for the job of deputy leader."

Chancellor George Osbourne has said there will be an extra Budget on 8 July, which will be used to set out welfare and departmental savings.

Image source, Reuters

UKIP MP Douglas Carswell calling on party leader Nigel Farage to "take a break" is "intriguing", political correspondent Iain Watson tells BBC Breakfast. "UKIP, of course, has the entirety of one MP, so if he is saying something about the leadership, people have to sit up and listen," Iain says.

BBC Breakfast

In Scotland, some Labour supporters such as the trade union Unite are trying to create a vacancy in the leadership, while in Westminster Labour is trying to fill a leadership vacancy in a search for a Ed Miliband's replacement, political correspondent Iain Watson tells BBC Breakfast. Chuka Umunna has stepped down from the contest, but there are plenty of other candidates to choose from, he says, including Yvette Cooper, Andy Burnham, Mary Creagh, and potentially Tristram Hunt.