Andrew Marr
The Andrew Marr Show

Now a scrap between Yvette Cooper and Nick Clegg over tuition fees. Will you rule out a further rise, says Ms Cooper? At the same time, Mr Clegg talks over her, will you guarantee early years education funding? No-one agrees to rule out or guarantee anything...

Andrew Marr
The Andrew Marr Show

Now all three of them are on the sofa - "I wouldn't do a deal with him," says Nick Clegg, "him" being Nigel Farage. Then he adds: "You also want to take away Strictly Come Dancing, that's far more important than an EU referendum."

Andrew Marr
The Andrew Marr Show

On the thorny question of legitimacy, the biggest party gets the first go, Mr Clegg says, and argues that the British people "won't understand" if that doesn't happen. There's a chronology to all of this that really matters, he adds.

Andrew Marr
The Andrew Marr Show

It's put to Nick Clegg that far from being over a barrel on tuition fees, he actually just changed his position. "That's complete rubbish... we were between a rock and a hard place," the Lib Dem leader insists. He says he had "to deal with the reality" which was that there was no money left. He says they provided the fairest possible deal they could to students in the circumstances.

Andrew Marr
The Andrew Marr Show

Onto the Scottish problem, as Andrew Marr calls it. Nick Clegg says "the tectonic plates are shifting massively" and there needs to be a constitutional commission to look at the entire issue. The key thing he believes is stability, because "a lot of people are getting rather worried". More devolution to the nations and region is vital, "to release the clammy grip of Whitehall on the governance of the country," he adds.

Andrew Marr
The Andrew Marr Show

Moving on now to the latest Lib Dem red line - an increase in public sector pay. "We've asked a lot of the millions of social workers, teachers, nurses and the 5.5 million people who work in our public services," Mr Clegg replies, and it's time to reward that.

Andrew Marr
The Andrew Marr Show

Andrew Marr keeps on trying. Nick Clegg says his party has always been consistent about having a referendum in the right circumstances, the Conservatives have been anything but. "I can't answer a question about how I think the're going to buckle again," the Lib Dem leader insists. How compatible or incompatible his red lines and someone else's red lines are depend on the mandate given by the British people, Mr Clegg adds.

Andrew Marr
The Andrew Marr Show

If David Cameron looks you in the eye on Friday and says, are you going to let me have my referendum or not, what do you say? "You're asking the question the wrong way round... you're putting it back to front" Mr Clegg says, smiling just a bit.

"Before I address anyone else's red lines, I will address mine," he goes on. "

Andrew Marr
The Andrew Marr Show

Nick Clegg is sticking to the line he's used until now - deflecting this question by accusing the Conservatives of "flipping and flopping" on what they want in terms of a referendum. But David Cameron has given a cast iron guarantee there'll be one if he's PM, says Andrew Marr. "It's about as cast iron as what he said about the Libson Treaty," says Mr Clegg - a referendum on that, of course, didn't happen.

Andrew Marr
The Andrew Marr Show

Right now, Nick Clegg, and first up, that EU referendum. Is that a red line for you? "My view remains that what David and Cameron and I did together in 2011... agreeing a referendum in the event of major treaty change - is the right way to go," the Lib Dem leader says.

Andrew Marr
The Andrew Marr Show

Nigel Farage reiterates his fears that David Cameron wont give the "full, free and fair referendum" UKIP want on EU membership. He agrees the conditions of that referendum will be a red line for his party giving any support to a Conservative government.

What about a coalition involving the Lib Dems? Mr Farage says that if Nick Clegg wants to be deputy prime minister again he'll change his mind and accept an in-out referendum.

Andrew Marr
The Andrew Marr Show

Nigel Farage isn't happy with the questioning on gay rights - he says the media only want to focus on "tiddly bits" of the UKIP manifesto and not huge issues like the economy and Europe. On the latter, Mr Farage says his party would have "friendship, free trade co-operation" with Europe - something like what my parents thought they were voting for when we joined the EU.

Andrew Marr
The Andrew Marr Show

Are you a Christian? Yes, I haven't always approved of its recent leadership, but yes, Mr Farage says. On the subject of gay marriage, the UKIP leader says there are plenty of LGBT UKIP supporters and candidates and gay people deserve their rights - but so too do Christian and Muslim people, and they have the right to say they don't approve of "certain lifestyles".

Andrew Marr
The Andrew Marr Show

On the future of the BBC, the UKIP leader says it's "far too big and far too influential". "I don't think it needs to do entertainment," for example, he argues. He says the BBC local websites are threatening local newspapers and says the corporation is "beginning to obliterate other voices". He also thinks the BBC has been unfair to UKIP during this campaign.

Andrew Marr
The Andrew Marr Show

Nigel Farage isn't keen to be labelled "a nascent English nationalist". He argues instead: "We are the only party represented in all four corners of the United Kingdom."

Andrew Marr
The Andrew Marr Show

"If only we could debate the big issues, rather than who's going to get into bed with whom on Friday morning," laments Nigel Farage. He argues that first-past-the-post is "now bankrupt" and thinks a vote for UKIP is a vote for electoral change - and that change will come.