The official report into the UK's involvement in the Iraq war will "not shy away" from singling out individuals for criticism.

Iraq Inquiry chairman Sir John Chilcot made the remarks in an interview with ITV broadcast on Tuesday night, on the eve of the report's publication.

Sir John is due to make a speech launching the report at 11am on Wednesday, and it will be published online shortly afterwards.

Speaking to ITV on Tuesday evening, Sir John said: "We hadn't set out to criticise individuals or institutions.

"However, I made very clear right at the start of the inquiry that if we came across decisions or behaviour which deserved criticism we wouldn't shy away from making it.

"And indeed, there have been more than a few instances where we're bound to do that.

"But we shall do it on the basis of a very rigorous analysis of the evidence which supports every such finding - we're not a court, we're not a judge and jury."

The inquiry's report will run to around 2.6 million words and be comprised of 12 volumes.

Gordon Brown announced he had appointed Sir John to lead the inquiry in June 2009 shortly before he officially took over as Prime Minister.

Brown said he had been advised the inquiry would only take a year.

Sir John has faced criticism for the delays in producing the report, including rebukes from Prime Minister David Cameron as well as from relatives of soldiers killed in the conflict.

Cameron remarked in October 2015 that he was "immensely frustrated" with the pace of the investigation.

Sir John told ITV he was "very conscious" of the expectations and wishes of the victims' families "to know the truth of what happened".

He added: "The families have been very much in our minds right from the outset.

"The first meetings the committee had were with family members and I'm very glad they will have the chance to get some of their questions answered when the report appears."

The inquiry was officially launched on July 30, 2009, and has heard more than 130 sessions of witness evidence and received around 150,000 documents.

In February 2015, Sir John admitted he had "underestimated" the time it would take his committee to study all the evidence given to them.

The report was also delayed by a process called "Maxwellisation", under which those who may face criticism - believed to include former Prime Minister Tony Blair - are given the chance to respond before publication.

The inquiry's remit included examining the actions and decision-making that led to the UK's participation in the March 2003 invasion.

The report is expected to examine in detail the intelligence failure that led to the case for war being made based on false information.

The inquiry will also report on British involvement in the war itself from 2003 until 2009, when UK combat operations in Iraq came to an end.

Relatives of the 179 British service personnel killed in Iraq during the war have also been given "early sight" of the report.

The Iraq Inquiry is estimated to have cost around £10m.

STV will have comprehensive coverage of the Chilcot report, the key findings, and all the reaction.

The STV website will run a liveblog throughout the day, bringing readers the major conclusions of the inquiry, features on the run-up to the war and what Iraq looks like today, plus commentary from all sides of the debate.

The STV News at Six will provide a breakdown of the report and what its likely consequences will be while Scotland Tonight, at the slightly later time of 11pm, will round off the day with in-depth analysis of the political fallout.