While Tony Blair would not have got involved in the detailed negotiations, members of his staff - who might well have been aware of the pounds 1m donation made to the Labour Party by Formula One's Bernie Ecclestone - were putting pressure on the Department of Health to break the manifesto pledge for a ban on tobacco advertising.
That was bitterly resented from within the department, by officials who had suffered years of tobacco lobby pressure from Margaret Thatcher.
The official chronology of Labour negotiations begins with a memorandum sent by Frank Dobson, Secretary of State for Health, to Mr Blair on 29 May, just four weeks after Labour had taken office. That memorandum sought Mr Blair's agreement to the negotiating position the Government was going to strike over a draft European directive on tobacco advertising. The directive had been opposed by the Tory government, but at a meeting with EU colleagues on 5 June, Tessa Jowell, the Minister for Public Health, offered British support.
By June, however, senior sources in the department had become acutely conscious that the Prime Minister's office might have been "nobbled". None of the senior people in the department knew at that stage that Mr Ecclestone had made his donation to the Labour Party, in January, or that he was offering further cash to the party in talks over the summer.
By the time that Mr Dobson sent Mr Blair another memorandum on 17 July, it was felt that the die had been cast - and the U-turn had already become embedded in the policy line being pressed by No 10.
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