Gordon Brown doesn't often admit making mistakes, but this morning on the Today programme, he confessed that he had made two over the 10p tax rate.
In normal circumstances, this would be an opportunity for David Cameron to indulge in the kind of "Punch and Judy" politics that he now admits he hasn't been able to abandon. But Cameron covered the 10p tax issue at length last week and so he is likely to be tempted by something else.
When Tony Blair was prime minister, he had to face questions at PMQs about a book quoting Brown saying he could not believe a word Blair said. Lord Levy has now written a book quoting Blair saying something similar about Brown and so there's a good chance we'll hear Brown getting a taste of the same treatment.
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Midday BST
We're off.
Global economic turndown
Brown is asked to promise that he will never say 3m unemployed is a price worth paying for economic stability (Was it Norman Tebbit who said that?). Predictably, Brown doesn't agree.
David Cameron
"The planted questions get tougher and tougher," he jokes.
The Tory leader asks Brown if he will make "major" changes to his plans to allow pre-charge detention for more than 28 days.
Brown claims the other parties agree with him on many aspects of this issue.
Cameron says he objects to legislation that threatens civil liberties and that could make the situation worse. He quotes Ken Macdonald, the director of public prosecutions, who says he does not think the extra power is necessary.
Brown says the police and Lord Carlile, the independent reviewer of terrorism, are on his side. He says the Conservatives should be ashamed of themselves for not backing it.
Cameron quotes from a leaked report from the Labour whips about the views of the party's MPs on the subject. One said he could be persuaded to stay away. Cameron says that's "straight from the PM's book of courage".
Brown accuses Cameron of ducking the substantial issue. Ministers might need the extra power in the event of a major terrorist incident. He says the sensible thing to do is deal with such an eventuality in a precautionary way. He stresses the proposed safeguards.
The Conservatives would be making a mistake if they opposed the issues, he says.
Cameron says the Tories have addressed the issues. They have called for the use of intercept evidence in court cases, which the government has now accepted, and for post-charge interviews, which is in the bill. Will the issue be a matter of confidence for the government?
Brown ducks this. He says he will put the bill before the House. As chancellor, he had to examine the case for terrorist asset freezes. This gave him the knowledge of the complexity of police investigations. The issue was whether there was arbitrary detention. The government has taken measures to rule that out.
Cameron asks who knows more about the complexity of prosecutions - the PM or the DPP. Again, he asks whether the vote will be a matter of confidence.
Again Brown ducks this, merely saying he will put the issue before the House. He points out that the commissioner of the Metropolitan police, Sir Ian Blair, is also in favour of 42 days.
Cameron points out that Brown hasn't answered the confidence questions. He predicts "another rebellion, another U-turn". He says Brown will end up doing what he had to do over the 10p rate. And he accuses Brown of putting "political calculation and self-interest" ahead of the right decisions in the national interest.
Brown again accuses of Cameron of not addressing the substance. He says Cameron wants to be tough on crime, but hug a hoodie at the same time. Cameron is a "shallow salesman" who never addresses the substance of an issue.
12.10pm
Stephen Pound
The Labour MP for Ealing North says Cameron is doing a magnificent job auditioning for the "sadly vacant chair of Sorry I Haven't a Clue". He invites Brown to have a go at Boris Johnson. The Speaker rules the question out of order
Nick Clegg
The Lib Dem leader says its obvious why low earners would not support the Tories. Why should they support Labour after the 10p tax row?
Brown says he is on the road to taking one million children out of poverty (the actual figures are 600,000, so far).
Clegg says Brown should act as if he cares for the poor if he wants people to believe that he does care for them. Switching to post office closures, he half-quotes Neil Kinnock, wondering why a Labour government would be "scuttling around" handing out closure notices to post offices.
Unemployment in Wales
Brown praises Labour's employment record in Wales.
12.20pm
Olympics
Geoffrey Clifton-Brown (Conservative, The Cotswold) says the public accounts committee called the Olympics budgeting process flawed.
Brown does not address the budgeting issue, but praises the London mayor for his contribution to winning the games.
Hunting
Paddy Tipping (Labour, Sherwood) asks the government to enforce the hunting ban more effectively. Brown ignores this, but points out that the Tories are committed to allowing another vote on this. Brown says it would be better to leave the issue alone.
Leadership
Mark Harper (Conservative, Forest of Dean) quotes Labour MP David Drew, who is about to be called, criticising Brown's leadership. Brown does not address this.
Drew is up next and the Stroud MP congratulates Brown for his stance on Darfur. Brown calls for a settlement in Sudan. He's "hopeful" of talks taking place in the next few weeks.
10p
Sir Robert Smith (Lib Dem, Aberdeenshire West and Kincardine) asks whether the compensation package will be published before the finance bill reaches its report stage.
Brown says the government is addressing the issue. But he does not answer Smith's point about timing.
Embryology bill
Brown confirms that Labour MPs will have a free vote on certain issues on this bill.
Northern Ireland economy
Peter Robinson (DUP, East Belfast) asks about economic revitalisation in Northern Ireland. Brown congratulates Robinson on succeeding Ian Paisley as DUP leader. He says there will be an investment conference next week.
12.25pm
Hospital deep-cleaning
Brown praises the deep-cleaning programme. He claims the Tories are opposed to extending access to GPs,
Labour loans
Douglas Carswell (Conservative, Harwich and Clacton) asks about the loans to Labour.
Brown says: "I knew nothing of these loans."
Bank holidays
Brown says this is an issue that is subject to consultation.
Potters Bar rail crash
James Clappison (Conservative, Hertsmere) says there has been no inquiry into the Potters Bar rail crash that took place six years ago. Brown says he will look into this.
Welsh nationalists
Brown urges people to support Labour if they want more jobs in Wales.
Embryology bill
Brown says there will not be a free vote on the third reading of this bill (ie the free vote will only cover certain amendments at report stage.)
Employment opportunities for the disabled
Brown says he wants to do more to get disabled people into work.
Disabled anglers
Bill Wiggin (Conservative, Leominster) says licence fees for disabled anglers are going up. Brown says he will look into it.
Crime in London
Brown praises neighbourhood policing in London.
Instant verdict
Soft questions: It was actually Norman Lamont in 1992 who said that higher unemployment would be a "price worth paying" for lower inflation. But Cameron was right to mock Brian Jenkins, the Labour MP for Tamworth, for asking a question that was risibly soft. When a question is so easy, it is hard for anyone to come up with an answer that makes a good impression.
42 days: The exchanges between Brown and Cameron on the counter-terrorism bill did not add much to the sum of human knowledge. But, with the 10p row out of the way (for now - as Brown's failure to give Robert Smith a full answer on this revealed, the government is not out of trouble on this yet), attention is going to focus on the 42 days issue. Cameron is almost certainly correct to predict further concessions on this.
The Levy allegations: Brown did not seem comfortable being asked about his knowledge of the Labour party taking loans, as well as donations. In his book, Levy suggests Brown knew more about this than he was letting on. I expect we haven't heard the last of this.
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