The Inquiry did not express a view on whether military action was legal - (previous post). Sir John noted that this could only be resolved by a properly constituted and internationally recognised court but the inquiry did conclude that "the circumstances in which it was decided that there was a legal basis for UK military action were far from satisfactory."
Here is a link to Volume 5 of the report where the legal advice is considered - Advice on the legal basis for military action, November 2002 to March 2003
There will undoubtedly be a massive amount of commentary on this report and I will add links below as they become available.
Statement from the Office of Tony Blair - 6th July 2016
Blair's statement at press conference - 6th July 2016
Prime Minister's statement to the House of Commons - 6th July 2016
Elizabeth Wilmshurst - The Guardian 7th July - We ignored the rule of law: the result was Iraq
Butler Review 2004 - Review of Intelligence on Weapons of Mass Destruction