The reason for going to war was to find WMDs - this report from the Sydney Morning Herald reminds us in the immediate aftermath of the invasion what Bush and Blair had told the world in the run-up. The idea there was some sort of reasoned discussion about regime change in the days before the war is a fallacy.

Blair's motion in the Iraq debate reads:

"That this House notes its decisions of 25th November 2002 and 26th February 2003 to endorse UN Security Council Resolution 1441; recognises that Iraq's weapons of mass destruction and long range missiles, and its continuing non-compliance with Security Council Resolutions, pose a threat to international peace and security; notes that in the 130 days since Resolution 1441 was adopted Iraq has not co-operated actively, unconditionally and immediately with the weapons inspectors, and has rejected the final opportunity to comply and is in further material breach of its obligations under successive mandatory UN Security Council Resolutions; regrets that despite sustained diplomatic effort by Her Majesty's Government it has not proved possible to secure a second Resolution in the UN because one Permanent Member of the Security Council made plain in public its intention to use its veto whatever the circumstances; notes the opinion of the Attorney General that, Iraq having failed to comply and Iraq being at the time of Resolution 1441 and continuing to be in material breach, the authority to use force under Resolution 678 has revived and so continues today; believes that the United Kingdom must uphold the authority of the United Nations as set out in Resolution 1441 and many Resolutions preceding it, and therefore supports the decision of Her Majesty's Government that the United Kingdom should use all means necessary to ensure the disarmament of Iraq's weapons of mass destruction; offers wholehearted support to the men and women of Her Majesty's Armed Forces now on duty in the Middle East; in the event of military operations requires that, on an urgent basis, the United Kingdom should seek a new Security Council Resolution that would affirm Iraq's territorial integrity, ensure rapid delivery of humanitarian relief, allow for the earliest possible lifting of UN sanctions, an international reconstruction programme, and the use of all oil revenues for the benefit of the Iraqi people and endorse an appropriate post-conflict administration for Iraq, leading to a representative government which upholds human rights and the rule of law for all Iraqis; and also welcomes the imminent publication of the Quartet's roadmap as a significant step to bringing a just and lasting peace settlement between Israelis and Palestinians and for the wider Middle East region, and endorses the role of Her Majesty's Government in actively working for peace between Israel and Palestine."

This statement is implicit - the reason for war was to disarm Saddam of WMD's and then deal with the consequences. The full text of the debate is available from Hansard and leaves you in no doubt WMDs were being posited as justification for the invasion of Iraq as the main thrust of Blair's argument is based on the presence of WMDs in Iraq.