From Chris Mullin's review of the fourth volume of Alastair Campbell's diaries:
Those from the "Blair is a liar" school of political history will find nothing here for their comfort. Campbell offers an insider's account of just about all the crucial meetings, and there is nothing to suggest that anyone knew Saddam did not still possess chemical or biological weapons. The consistent advice offered to ministers by the spooks was that he did. No sooner has Iraq been "liberated", however, than the spooks begin to have second thoughts. Five weeks after the invasion Campbell reports a phone call from the head of MI6, John Scarlett, who asks with touching naivety: "How big a problem would it be if we didn't find any [WMD]?" Now they tell us. The bottom line is that Iraq was an intelligence screw-up. In the circumstances, the spooks got off remarkably lightly.
A necessary reminder.