I saw a report on Newsnight, I think, a few days ago, in which it looked like the committee wasn't going to publish this. From his evidence:
I quizzed my colleagues in the FCO and MOD working on Iraq on several occasions about the threat assessment in the run-up to the war. None told me that any new evidence had emerged to change our assessment; what had changed was the government's determination to present available evidence in a different light. I discussed this at some length with David Kelly in late 2002, who agreed that the Number 10 WMD dossier was overstated.
...
Resolution 1441 did not authorise the use of force in case of non-cooperation with weapons inspectors. I was in New York, but not part of the mission, during the negotiation of that resolution (I was on Special Unpaid Leave from the FCO). My friends in other delegations told me that the UK sold 1441 in the Council explicitly on the grounds that it did not represent authorisation for war and that it "gave inspections a chance".
Later, after claiming that Iraq was not cooperating, the UK presented a draft resolution which offered the odd formulation that Iraq had failed to seize the opportunity of 1441. In negotiation, the UK conceded that the resolution amounted to authority to use force (there are few public records of this, but I was told by many former colleagues involved in the negotiation that this was the case). The resolution failed to attract support.
The UN charter states that only the Security Council can authorise the use of force (except in cases of self-defence). Reviewing these points, it is clear that in terms of the resolutions presented by the UK itself, the subsequent invasion was not authorised by the Security Council and was thus illegal. The clearest evidence of this is the fact that the UK sought an authorising resolution and failed to get it.
http://news.independent.co.uk/uk/politics/article2076142.ece