Earlier this year, in response to news that the long-awaited report would not be published until after the general election in May, the Scottish Parliament unanimously backed a motion calling for the report to be published before the election.

Having missed the pre-election deadline, a source involved in the inquiry told BBC’s Newsnight that "they [the inquiry] gave up trying to speed things up".

It is now over five years since the Inquiry led by Sir John Chilcot started to take evidence from witnesses involved in the period leading up to the illegal invasion of Iraq – including Prime Minister Tony Blair who said in his first evidence session that he had 'no regrets' about the war.

Commenting, Mr Ingram said: “For the Chilcot report to be subject to yet more delays is completely unacceptable, and will be greeted with dismay by the hundreds of thousands of people whose lives were affected by the Iraq war.

“People deserve full disclosure about how the Labour government at Westminster operated in the lead up to this disastrous war.

“There is clear cross-party support both the Scottish Parliament and Westminster for early publication of this vital report – subjecting it to yet more delay is quite frankly an affront to democracy and the process of Parliamentary scrutiny.

“The Iraq war was a foreign policy disaster whose ramifications are still being felt today. Answers are long overdue, and the continued delays to the publication of this report cannot are a democratic outrage.”