James Landale, BBC deputy political editorpublished at 12:15 Greenwich Mean Time 14 January 2015
Tweets, external: Rare moment: Nick Clegg barracks David Cameron over his reluctance to debate on TV without Greens. "Excuses, excuses", he says.
David Cameron and Ed Miliband began their exchanges with need to protect UK from terrorism
Ed Miliband then accused the PM of being "frit" of taking part in election TV debates
David Cameron said the Labour leader was "chicken" of being in a debate with the Greens
Home Secretary Theresa May is making a post-PMQs statement on Paris terror attacks
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Pippa Simm, Aiden James and Alex Hunt
Tweets, external: Rare moment: Nick Clegg barracks David Cameron over his reluctance to debate on TV without Greens. "Excuses, excuses", he says.
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The leaders' exchanges are over - and Sir Roger Gale has the first backbench question to the PM. He says BBC Director General Tony Hall has turned down a request to appear before a parliamentary select committee, and calls for a review of parliamentary privilege. David Cameron says the BBC is publicly accountable, and tells the MP he will have a careful look at his suggestion.
Tweets, external: Cameron was on a sticky wicket over debates but somehow he managed to win that #PMQs
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Back to David Cameron - who repeats his question to Ed Miliband. Borrowing a phrase from Margaret Thatcher, Mr Miliband accuses the PM of being "frit". Mr Cameron says his opposite number wants to "debate the debates" because he has nothing to say on the economy.
Tweets, external: Ronnie Campbell clucking like a chicken at Cameron over debates. Top notch arm flapping...
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David Cameron reminds the House that the Greens and UKIP both beat the Lib Dems at this years European elections - to cheers from the Tory benches and a bit of barracking from Nick Clegg sat behind him - and says "you either have both of them or none of them - why is he so chicken of the Greens?" But the Labour leader contends Mr Cameron is running scared - and says no-one will believe his excuses.
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Ed Miliband accuses the PM of using the Greens as an "excuse" to avoid the debates. He says it is not for party leaders but broadcasters to decided the terms of the debate.
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Ed Miliband moves his questioning on the TV election debates - quoting comments made by David Cameron in 2010 in support of election debates. Mr Cameron says he is all for the debates to take place but says you can't include some minor parties and not others. He claims Mr Miliband is scared to debate with the Greens.
Tweets, external: Miliband going in on France attacks. Will a LibDem claim that Cam trying to 'weaponise' terror debate via 'snoopers charter'?
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The PM says the counter-terrorism bill - currently going through Parliament - is vital in defeating terrorism. This is no "zombie parliament", he adds. Ed Miliband says he is glad they can work across parties on the issues.
Tweets, external: Labour's energy price trap for the Tories http://bit.ly/14yZdMo by @isabelhardman
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Responding, David Cameron agrees on the importance of "standing together" in support of the values "we hold dear". He says the UK must be prepared for any attack that may take place - and adds that this includes confronting the "poisonous narrative" of Islamist extremism, adding that the government has introduced a duty on public bodies to report any such behaviour.
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Ed Miliband is on his feet, and uses his opening remarks to comment on last week's "dreadful" terrorist attacks in Paris. Those that seek to divide us will fail, he says. He stresses the need to stop people becoming radicalised in the first place - and says the Prevent programme should be expanded to included community-led action.
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Mr McClymot asks the PM about the impact on business confidence of his plans for an in/out referendum on the EU - and seeks a guarantee that he will not support an "out" vote. David Cameron says business investment has gone up since he announced his plans for a referendum.
David Cameron is on his feet for the 30 minute weekly questions session.
Just a few minutes to go until Prime Minister's Questions. Gregg McClymont, the Labour MP for Cumbernauld, Kilsyth and Kirkintilloch East, will have the first question to David Cameron.
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Responding to a question from Labour MP Pamela Nash, Scottish Office minister David Mundell said delivery firm City Link's entry into administration was "deeply regrettable".
Ministers are working to ensure that "support is available for those made redundant in Scotland", he adds.
City Link's administrators announced 2,356 job losses on New Year's Eve after rejecting an unnamed consortium's last minute offer to save the company. A total of 51 depots are due to be permanently closed by 15 January.