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Do you agree that it must be the party with the most seats that forms the government, Ed Balls is asked. "In politics, you have to accept the result that people give you," he replies.

Pressed again, presenter Mark Mardell asks if it would it be illegitimate for the smaller of two parties to form a government.

"That is what David Cameron is saying this weekend because he knows he's going to be the first Conservative leader to fail to win a majority... it's clearly nonsense," the shadow chancellor says.

Finally, Mr Balls, would you ever run against your wife for the Labour leadership? "Not on this planet, in this universe, in this century... not ever."

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Michael Jacobs, a former special adviser to Gordon Brown, says he doesn't recognise the description of Ed Miliband as someone who struggles to make decisions. He made big changes to the energy market in a relatively short time, Mr Jacobs argues.

But Jason Cowley, from the New Statesman, says Ed Miliband has missed an opportunity to win outright here. Disaffected Lib Dem voters were up for grabs, and there is a bleeding of support from the Conservatives to UKIP. "If Labour can't win in these circumstances they're in real trouble," he adds.

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You're haunted by your reputation, by that note, are you not?

Ed Balls replies: "Liam Byrne wrote a silly note. It was intended to be silly and it was indeed a silly note to write. It's something he's reminded about regularly." But the shadow chancellor insists, in 2015 what matters is who's going to make lives better for ordinary families.

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Ed Balls is now on The World This Weekend. He says people are asking whether they can trust what Labour is offering. I think they can, he argues, restating his insistence that his party offer a better alternative for the future.

Is it fair to say that overspending left Britain more exposed to the global financial crisis than other countries? "Of course it's not," Mr Balls replies. "The Tories, of course, for ideological reasons want to blame Labour's spending," but he says the Conservatives backed those spending plans at the time.

The Conservatives have accused Labour and Plaid Cymru of being involved in an "unedifying squabble" over who to support if there is a hung parliament.

Welsh Secretary Stephen Crabb was speaking after Friday's final televised debate before the election.

"There's only one party that's in a position to secure an overall majority and that's the Welsh Conservatives," he told the Sunday Politics Wales show.

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In the spirit of today's Lib Dem red line on public sector pay, the party's schools minister David Laws has told the National Association of Head Teachers that its members should be valued "through their pay packet". He said it was "time to end the period of real pay cuts" for public sector staff. Read our full story.

Carole Walker
Conservative campaign correspondent

With just a few days left to win over wavering voters, David Cameron is back to his core message - that under his leadership Britain is on the road to recovery and it would all be put at risk if Ed Miliband were to win power, dependent on the SNP. No matter that the Labour leader has used ever-stronger language to rule out a deal or pact with the Scottish Nationalists, the Conservatives say the figures will make it impossible for Mr Miliband to govern without relying on the SNP to get his programme through.

Tory strategists believe this message is resonating with English voters in key marginal seats, such as Nuneaton where Mr Cameron delivered his speech today.

The strategy could also have significant consequences for the manoeuvring to form a government post-election. If the Conservatives win the most seats but without an overall majority, they are likely to claim that they have a democratic mandate to form the next government. Ed Miliband has been forced into a position where it will be almost impossible for him to count on the SNP. Some form of agreement with the Liberal Democrats is possible but far from certain.

So the Conservative strategy of keeping up the relentless warnings of the risks of Labour in power, relying on the SNP, has boxed Ed Miliband into a position were it could be harder for him to prise David Cameron out of Downing Street.

Chancellor George Osborne has had a dig about the pledge stone. He compared the Labour move to former party leader Neil Kinnock's famous "we're alright!" outburst before the 1992 general election.

David Cameron is now speaking in Nuneaton. He's discussing the SNP threat. "How much would the SNP care about Nuneaton, about Warwickshire?" he asks. "They'd probably need a compass to find it."

He made a similar point last weekend about Shropshire.

In Nuneaton, Mr Cameron also told voters now wasn't the time for a protest vote, and in particular, he warned against voting Lib Dem thinking it would result in his being prime minister. Nick Clegg, he said, had been clear he'd work with Ed Miliband too.

Mr Cameron continued: "Remember this - if you've got an opinion about who you'd prefer as your prime minister, express it at the ballot box. The outcome won't be decided in any other way. Don't risk voting for any other party and hoping that's the outcome. If you want your preferred rime minister, get out there and vote for it."

In a speech in Worcester, Labour leader Ed MIliband says he won't stand again if Labour fails to cut tuition fees. "I will cut tuition fees from £9,000 to £6,000, and I tell you this: If I fail in this task, I won't be standing here again in 2020 making more promises. I won't be standing for the office of prime minister at all, because there should be consequences when people's trust is let down." He added that he was determined to restore young people's faith in politics.

Andrew Neil
Daily and Sunday Politics

"I think the reason a lot of people think it will go the Tories way at the last minute is because they're thinking of psychology," journalist Isabel Oakeshott tells the Sunday Politics. "It is a basic sort of risk aversion among people that if they're not sure, they're more likely to go with what they think is the least risky option." She says that in the last few days the Tories will be really playing to that, scaremongering, and saying, 'You really can't risk the economy again.'"

Andrew Neil
Daily and Sunday Politics

"I think it is absolutely crazy that you've already got the Labour leader commissioning great stones that are going to be engraved like the commandments of Moses or Hammurabi with what he wants to do," the London mayor says. "This election is very, very far from a foregone conclusion... The idea of a hung parliament is very far from a foregone conclusion."