It is expected that the report will criticise Blair for telling Bush a year before the war that he would support military action

Tony Blair, Jack Straw and Sir Richard Dearlove will face serious “damage to their reputations” from the Chilcot report into the Iraq War, which has delivered an “absolutely brutal” verdict on the mismanagement of the occupation.

A senior source who has discussed the report with two of its authors has revealed that Blair “won’t be let off the hook” over claims that he offered British military support to the American president at the time, George W Bush, a year before the 2003 invasion.

Dearlove, the former head of MI6, and other intelligence chiefs will be criticised for failing to prevent Downing Street from putting a “gloss” on the intelligence surrounding Saddam Hussein’s weapons of mass destruction, which led to the claim in the “dodgy dossier”