The Commons debate in quotes
The debate appears to have gone off the boil, so here are a selection of quotes from earlier in the day:
David Cameron, British PM: "This is not 2003. We must not use past mistakes as an excuse for indifference or inaction. Let's be clear: Inaction does not amount to a strategy for our security or for the Syrian people but inaction is a choice. I believe it's the wrong choice. The question before the House today is how we keep the British people safe from the threat posed by Isil. This is not about whether we want to fight terrorism, it's about how best we do that.
"The question is this: do we work with our allies to degrade and destroy this threat and do we go after these terrorists in their heartlands, from where they are plotting to kill British people. Or do we sit back and wait for them to attack us."
Jeremy Corbyn, Labour leader: "It is critically important that we are honest with the British people about the potential consequences of the action the Prime Minister is proposing. The spectre of Iraq, Afghanistan and Libya .... looms over this debate. To oppose another reckless and half-baked intervention isn't pacifism. It's hard-headed common sense.
"The logic of an extended air campaign is in fact mission creep and western boots on the ground, whatever the Prime Minister may say now about keeping British combat troops out of the way, are a real possibility."
Alan Johnson, Labour former home secretary: "I find this decision as difficult as anyone to make, I wish I had frankly the self-righteous certitude of the finger-jabbing representatives of our new and kinder type of politics, who will no doubt soon be contacting those of us who support this motion tonight, but I believe that Isil, Daesh, has to be confronted and destroyed if we are to properly defend our country and our way of life and I believe that this motion provides the best way to achieve this objective."
Julian Lewis, Tory chairman of the Commons defence select committee: "Instead of having dodgy dossiers, we now have bogus battalions of moderate fighters."
Angus Robertson, SNP leader in Westminster: "The point is, there is bombing currently under way in Syria and to pretend that what is being proposed while not taking that into account is highly misleading."
Crispin Blunt, chairman of the foreign affairs select committee: "To my mind, Isil is such a clear and present danger to the civilised world that if all necessary means are endorsed by the security council then so should this House." -
Tim Farron, Liberal Democrat leader: "We are absolutely under the spectre of a shocking, illegal and a counter-productive war in Iraq and that's a lesson from history we must learn from. The danger is today that for too many people we'll be learning the wrong lessons from history if we choose not to stand with those refugees, not to stand as part of the international community of nations."
Rainham Rehman Chishti, Conservative MP: "This barbaric terrorist group is not Islamic nor is it a state and Daesh is a better term for it. I hope that media organisations will now follow the Government's lead and also adopt the term."
Meanwhile, and if you have the time, David Cameron has put his entire speech on Facebook. You can read it here.