The long-awaited report into Britain's involvement in the Iraq War has delivered a scathing verdict on Government ministers' justification, planning and conduct of the military intervention which "went badly wrong, with consequences to this day".
Former Prime Minister, Tony Blair, was criticised for presenting the case for war with "a certainty which was not justified" based on 'flawed' intelligence about Iraq's supposed weapons of mass destruction.
In the 2.6 million word report into the UK's most controversial military engagement since the end of World War II, Sir John Chilcot said Mr Blair was wrong to claim that the risks of instability following the invasion could not have been known in advance.
The report makes no judgement on whether military action was legal but the inquiry did find that Attorney General Lord Goldsmith's decision that there was a legal basis for UK involvement was taken in a way which was "far from satisfactory'.
The report does not support the claims that Tony Blair agreed a deal "signed in blood" to topple Saddam Hussein when he met George Bush at his ranch in Crawford, Texas, in April 2002.
But it reveals that in July that year - eight months before Parliament approved military action - Mr Blair committed himself in writing to backing the US President over Iraq, telling him: "I will be with you whatever."
The report, following a seven year inquiry, found that the use of force to remove the Iraqi dictator was undertaken at a time when he posed "no imminent threat" and in a way which undermined the authority of the United Nations Security Council.
Sir John Chilcot also criticised how prepared troops were for the US led invasion in which 179 British Military Service personel were killed.
The risks of a hastily-prepared military mission to invade and occupy four provinces of southern Iraq were not properly identified, leading to shortfalls in key equipment such as helicopters and surveillance gear.
The Ministry of Defence was "slow" to respond to the threat from insurgents' roadside bombs, resulting in delays in the supply of armoured vehicles to protect troops which "should not have been tolerated".
And the Blair Government's "wholly inadequate" preparations for the aftermath of war "failed to take account of the magnitude of the task of stabilising, administering and reconstructing Iraq".
Mr Blair over-estimated his ability to influence US policy at a time when ministers were aware of the "inadequacy" of Washington's plans.
The report acknowledged that the initial campaign to overthrow Saddam was successful and praised the "great courage" of service personnel and civilians involved during and after the invasion, which led to the deaths of more than 200 UK nationals and at least 150,000 Iraqis.<
But it found that Britain's military role "ended a very long way from success" and it was "humiliating" that the UK was reduced to doing deals with a local militia group in Basra, releasing captured militants in return for an end to attacks on British forces.