A long-delayed report on Britain's involvement in the Iraq war will be published on July 6, seven years after the inquiry began, officials say.
The Iraq Inquiry said on Monday that security checking of the report by retired civil servant John Chilcot had been completed, without any redactions being sought, and the 2.6 million-word document would now be prepared for publication.
The inquiry into mistakes made before and after the 2003 US-led invasion of Iraq held public hearings between 2009 and 2011, taking evidence from more than 150 witnesses, including former Prime Minister Tony Blair, and scouring 150,000 documents.
The inquiry has cost more than STG10 million ($A19.6 million), but its report has been repeatedly delayed, in part by a process that gives those who are criticised a chance to respond.
Families of troops killed in Iraq say the delays are prolonging their grief as they search for answers about how Britain ended up in the conflict.
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Britain's involvement in the war - in which 179 UK personnel died between 2003 and 2009 - remains a divisive issue.
