THE HEAD of MI6 told Tony Blair that the case for war against Iraq was being “fixed” by the Americans to suit the policy, according to a BBC documentary that will reignite its battle with the government.

Blair followed the US lead by failing to reveal publicly doubts about the quality of intelligence that he had requested to support the case for war, the programme claims.

Sir Richard Dearlove, head of MI6, briefed Blair and a select group of ministers on America’s determination to press ahead with the war nine months before hostilities began.

After attending a briefing in Washington, he told the meeting that war was “inevitable”. Dearlove said “the facts and intelligence” were being “fixed round the policy” by George W Bush’s administration.

The allegations against Blair just weeks before a general election are likely to reopen the feud between the government and the BBC that came to a head over the death of Dr David Kelly, the former weapons inspector. It led to the resignations of Gavyn Davies, its chairman, and Greg Dyke, its director-general.

The documentary — to be shown on BBC1’s Panorama tonight — reveals that Britain and America were anxious to present a united front on Iraq despite a paucity of new data on Saddam Hussein’s weapons of mass destruction (WMD).