Rehman Chisti MP - who has been campaigning for the government to refer to IS/ISIL as Daesh - welcomes the government's change of heart, and calls for the BBC to change its "bizarre policy" of saying, he says, that using Daesh would breach impartiality rules. David Cameron agrees.

Image source, AP

It's not just the British parliament that is getting ready to vote on military action in Syria - Germany looks likely to vote in favour of doing so on Friday.

There's just one issue: it has emerged today that almost half of Germany's Tornado jets are not airworthy.

You can read more about it here.

Conservative MP John Baron, who sits on the Foreign Affairs Committee and who is opposed to military action in Syria, says many MPs are concerned by the "lack of a comprehensive strategy, both military and non-military, including an exit strategy".

The prime minister contends there is a strategy and stresses that air strikes are "only one part" of it. He argues that the UK cannot wait until a political solution is in place, warning "the threat is now". 

David Cameron continues to face repeated interventions over his terrorist sympathiser remarks and demands that he apologise. He suggests MPs should be getting on with the debate.

David Cameron - who is flanked by his chancellor, George Osborne and Commons leader Chris Grayling - tells MPs the risks of inaction are "far greater" than that of the military action he is proposing.  

The prime minister continues to take flak from the opposition benches for calling those opposed to air strikes "terrorist sympathisers". He responds: 

It looks like this issue isn't going to go away in the debate.

Ian Paisley, the DUP MP for North Antrim, seeks guarantees that British troops will not be used in combat operations without parliamentary authorisation. David Cameron says British troops on the ground would be a "mistake". The motion rules it out.

Dr James Strong

Greg Surtees

David Cameron reiterates what he told MPs in a Commons statement the other week setting out his case for air strikes in Syria, that the government's approach is an "IS-first strategy".

Lib Dem Tom Brake says he'll be backing the government in the vote, but he thinks David Cameron should apologise for what he said about opponents of the air strikes last night. His intervention follow earlier ones from Caroline Flint and Alex Salmond. Here's BBC political editor Laura Kuenssberg's view:

David Cameron tells MPs that the government's proposal to extend UK bombing to Syria is legal, necessary "and the right thing to do is to keep the country safe".

MPs should make clear, he says, that "we take up our responsibilities, rather than pass them off and put our own national security in the hands of others".

BBC Newsnight

Prime Minister David Cameron has called Jeremy Corbyn, and other opponents of action in Syria, "terrorist sympathisers".

It's a label that Conservative MP John Baron, who opposes air strikes, rejects.

Speaking to BBC Newsnight, he said: "I've served in the army, I've served on the streets of northern Ireland... I was a platoon commander in Northern Ireland, and I do think we must not resort to such language. 

"Instead we should look at the actual evidence before us, and there is clearly a lack of ground forces to take Daesh [IS] on, and that's one of the key issues we've got to address."

Watch the full BBC Newsnight special debate on air strikes in Syria here

The SNP's foreign affairs spokesman Alex Salmond intervenes to complain about the prime minister's "terrorist sympathiser" remarks which he says were "deeply insulting". He, too, is after an apology. The prime minister gives the same response as he did to the previous interventions.

David Cameron says the UK faces "a fundamental threat" to its security from the self-styled Islamic State group, and adds that seven plots on home soil have been foiled this year alone. 

He says the UK must work with its allies and go after the terrorists "in their heartlands".

Lee Henderson