Ulster Unionist Tom Elliott says he will be voting for air strikes, a decision he says he is "not taking lightly."

He hopes it will protect the citizens of the United Kingdom and the "western world".

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The SNP's Stewart Hosie says the key questions the PM "has not yet answered" concern the efficacy of the bombing. He says a "proper plan" for post-conflict reconstruction and stabilisation in Syria is lacking, too. And on those bases, we simply can't go to war."

House of Lords
Parliament

Conservative peer Lord Dobbs backs action in support of France but says he has "considerable reservations". He asks why the use of troops has been ruled out: "What are our troops for if not to deal with a fundamental threat to our national security?"

Conservative Sir Edward Leigh says he is "full of doubt" about this decision.

He says our involvement will make "some difference", but notes that in Iraq we are supporting a legitimate government, while that is not the case in Syria.

He says "Isil is an idea, not just a criminal conspiracy" and military action alone will not defeat it.

He says that he will vote for action if the Secretary of State can convince him there is a "direct threat" to UK citizens from Isil.

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Crispin Blunt, Conservative MP, says David Cameron's "frothy rhetoric" was at a private meeting of Conservative MPs. He says the fallout over his comments "made it slightly more difficult for him to get his case across" in the chamber today. But he says the fact there was "so much focus" on it in the chamber "spoke volumes about the arguments and the analysis really sat on the prime minister's side of the argument".

Conservative MP Andrew Murrison tells MPs that he rebelled against his party over the 2003 Iraq War but won't be doing so this time, arguing that so-called Islamic State must be confronted with "lethal force". 

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Chris Bryant, Labour's shadow leader of the Commons, says David Cameron "hasn't covered himself in glory" today and should've apologised for his "terrorist sympathisers" remarks.

But he says the bigger issue is whether or not to back air strikes, and he says "reluctantly" he'll be voting in favour of them.

Labour MP Joan Ryan says she will be voting in favour of air strikes.

She says IS are responsible for "war crimes", and pose "a clear and present danger to the UK, at home and abroad."

She says "it is not right" to expect our allies to fight IS "on our behalf".

House of Lords
Parliament

Labour peer Lord Berkeley speaks against bombing Syria. "We seem to be moving into a war situation of our own making," he says, adding that  the conflict looks like "a religious war".

"Why do we want to be in this one?" he asks, also claiming that the UK tends to switch sides in such conflicts: "We do change our favourites rather too often for credibility."

The SNP's Angus MacNeil will be voting against air strikes, arguing that bombing fuels radicalisation and is counter-productive.

He says policy amounts to "something must be done, even if it's the wrong thing."

He looks back to the 2003 invasion of Iraq and attacks the "appeasement" of George Bush by the "poodle Tony Blair".

House of Lords
Parliament

Former Liberal Democrat leader Lord Ashdown gives his support for the government's motion and hopes it marks "a watershed" in UK foreign policy. "For the last 10 years since 'shock and awe' we have been obsessed with high explosive as our single instrument of foreign policy," he tells peers.

He claims UK governments have forgotten the words of Prussian general Carl von Clausevitz that "war is an extension of diplomacy by other means". He argues that forgetting this in Afghanistan, Iraq and Libya meant that "we lost".

He adds that Islamic State militants will not be defeated by "bombing alone" but by the "coalition being constructed" by international diplomatic efforts in Vienna.

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Speaking to BBC News earlier Lord Dannatt, former head of the British Army, said: "We have not yet got an adequate force that can defeat Isil/Daesh on the ground."

He says once that force is put together it can defeat IS and become the "stabilisation force" to ensure a "more secure" future for Syria.

Asked how much difference, militarily, RAF air strikes in Syria can make, he says it'll make "some difference" but proportionately not much.

But what's important is that the UK sends "a signal" that it is "a fully committed member of that international coalition to defeat Isil", Lord Dannatt adds.

Labour MP Ivan Lewis says IS cannot be defeated without "significant ground forces".

He says the air strikes will do "little or nothing" to defeat IS, and says a longer term strategy is needed.

He says he will vote against the motion because this strategy does not exist at the moment.

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Speaking to the BBC, shadow home secretary Andy Burnham says that deciding whether or not to back Syria air strikes is probably the most difficult decision he's had to make as an MP. It's a very complex situation, he says.

"I believe the case has not been fully made by the prime minister," Mr Burnham says, adding that clarity is needed on the plan for the ground in Syria.

He says he doesn't rule out military intervention completely - but he doesn't think it's right now.

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Former Labour Foreign Secretary Margaret Beckett has condemned the online abuse that some of her fellow Labour MPs are facing for backing further airstrikes in Syria. Speaking on BBC chief political correspondent Vicki Young, she said: