Report of the Iraq Inquiry was published on 6 July 2016.
From the links on the page you can access the Executive Summary and the Report, search the supporting documents and review transcripts and recordings of the original hearings.
From METRO: The 12-volume, 2.6 million-word report, which comes at a turbulent time in British politics... found that British military action was not the last resort and that policy on Iraq was made on the basis of flawed intelligence that was never challenged.
From the Independent:
Sir John Chilcot has published his long awaited report into the Iraq War.
The Iraq Inquiry has concluded the war was "unneccessary" as Saddam Hussein posed no immediate threat to the US or the UK.
Sir John said the secret intelligence reports "did not justify" former Prime Minister Tony Blair's belief in the presence of weapons of mass destruction (WMDs) but found that Mr Blair did sincerely believe they were there.
In direct contradiction to what Mr Blair told the inquiry, Sir John also found he and George W Bush were made aware that the country could descent into sectarian civil war after the invasion so "hindsight was not required".
See also RT.com