The inquiry aims to shed light on every aspect of Britain's involvement with Iraq from 2001 to 2009, from the build-up to the US-led invasion in 2003 to the withdrawal of combat troops, and to identify lessons that can be learned.
"My colleagues and I estimate that we will be able to complete the text of our report in the week commencing 18 April 2016. At that point, national security checking of its contents ... can begin," John Chilcot said in a letter to Prime Minister David Cameron published on the inquiry's website.
Chilcot said due to the length of the report - more than 2 million words in total - it would then take many weeks to prepare for printing, making publication in June or July most likely.
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