Why did No. 10 ignore the CIA’s advice that the 45-minute claim was nonsense?

Bob Woodward of Watergate fame has just published an account of the background to the Iraq war called Plan of Attack. It has attracted a good deal of publicity in this country, particularly for its assertion, which has not been denied, that President George W. Bush told Tony Blair shortly before hostilities began that there would be no hard feelings if British troops were not involved.