Nick Robinson
Political editor

tweets: , externalSNP MPs to vote against military action in Iraq as they have "deep deep worries" re a "3rd Iraq War" says @MorayMP

The Scottish National Party's Westminster leader, Angus Robertson, says the House is agreed on the "brutality" of IS and that there is a case for something to be done. Yet many people listening to the debate are rightly worried about the potential for mission creep and a third Iraq war, he cautions.

Mr Robertson questions what the government's plan is once the bombing starts - noting that there is "no commitment" in the motion for post-conflict resolution. For those reasons, the party will vote against the government, he informs MPs.

Widney Brown, Physicians for Human Rights

tweets:, external In debate over #US bombing in #Syria we must remember #pain, #suffering of Syrians, external. @elise__baker @P4HR

Labour MP Jeremy Corbyn, who is a fervent anti-war campaigner, says he believes the motion "leads us into one war after another".

He tells MPs he believes there has to be a political solution to the problem of IS within the region.

Backbench speeches have just been further curtailed to three minutes - owing to the number of MPs wanting to take part in the debate. Just a reminder that the vote is expected at 17:00 BST.

André Gomes emails: "George Galloway is absolutely right! Also, IS must be fought by Muslims as this will also allow western populations to realize that those with extremist views correspond to a small minority of Muslim populations."

PM David Cameron is on the front bench, listening to the debate and the views of backbenchers.

Lord Howe of Aberavon, the Conservative former chancellor, touches on the recent Scottish referendum when he discusses how we should respond to the threat of Islamic State as "a still-United Kingdom".

He concludes that he has "no difficulty" supporting the position of the US and UK governments because of the threat IS poses to British interests and democracy in general.

MP Zac Goldsmith tweets, external: Fascinating, thoughtful speech by @RoryStewartUK. One of the few genuine experts on the ME. Why on earth is he not in the Foreign Office?

MPs are now listening to a speech from the Conservative chair of the Defence Select Committee. Rory Stewart says the debate has highlighted the "complexity" of the situation in the Middle East - "from Turkey to almost Turkmenistan".

But he says the motion before the House is simple - and should be supported. He is of the view that air strikes are a "sensible response" to the problems posed by IS.

Writing on his blog, he recounts how he visited Iraq last month and saw "why air-strikes can be worthwhile", external.

Mr Stewart was appointed as Coalition Deputy Governor, responsible for two provinces in the Marsh Arab region of Southern Iraq, following the coalition intervention in Iraq in 2003.

Lord Trimble differs from previous speakers in his analysis of potential allies, saying there is "not much prospect" of Russia coming to the coalition's aid, that Iran has "at least two faces", and asking "what kind of country what we would be" if we cooperated with Assad.

Labour Co-operative MP Meg Munn talks about the "self-glorification" by IS through its release of videos of the torture and murder of Iraqi soldiers, and its persecution of other religious and minority groups. Ms Munn tells MPs she is "deeply troubled" by the way the international community has "stood on the sidelines".

The MP - who co-chairs of the Kurdistan Region of Iraq All-Party Parliamentary Group - says the region is "under attack" from IS. She pledges her support for the motion - but urges the government to keep "an open mind" on possible further action in Syria.

Lord Trimble, former first minister of Northern Ireland who sits as a Conservative peer, says it would be "a ridiculous situation" if Parliament had to be consulted every time a new military action is planned and that it would amount to "interference" from politicians in military tactics.

The number of Europeans joining Islamist fighters in Syria and Iraq has risen to more than 3,000, the EU's anti-terrorism chief Gilles de Kerchove has told the BBC.

Labour's Lord Judd, a former Foreign Office minister, cautions against reducing the conflict between the US-led coalition and Islamic State as a struggle between good and evil.

He argues that the behaviour of the UK and US has contributed to the anti-western ideology of IS terrorists.

Sir Edward is critical of the government's plan to bomb IS militants only in Iraq. He says it makes no military sense and questions whether the strategy will be effective.

However, he says that despite his "severe doubts" he will support the motion, based on the experience of his visits to Iraq and the conversations he had with people there.

Conservative Lord Cormack says "we are going to need boots on the ground" and that "if we are going to win hearts and minds... then we are going to have to have great emphasis on humanitarian aid".

Sir Edward Leigh, a senior Conservative MP, criticises successive UK foreign policy in the Middle East.

He says the UK's "zealous liberalism" has encouraged revolutions across the region and yet we are "shocked" when these forces turn against us. "In that sense the British government is indirectly culpable in fostering the conditions for jihadism to thrive in Iraq and Syria," he argues.

Jonathan: "Further military operations in Iraq will just create more enemies and slow down potential growth in the UK."

Labour MP Michael Meacher says the only justification in his mind for military action is not solely to halt IS's momentum but to "buy the time" to put in place a political and diplomatic framework to restore the "broken" Iraqi state.