Apparently they are going to prevent us reading this, rather than try to argue black is white (as they are with the London bombings and their connection with Iraq) once it gets published:
No 10 blocks envoy's book on Iraq
Martin Bright and Peter Beaumont
A controversial fly-on-the wall account of the Iraq war by one of Britain's most senior former diplomats has been blocked by Downing Street and the Foreign Office.
Publication of The Costs of War by Sir Jeremy Greenstock, UK ambassador to the UN during the build-up to the 2003 war and the Prime Minister's special envoy to Iraq in its aftermath, has been halted. In an extract seen by The Observer, Greenstock describes the American decision to go to war as 'politically illegitimate' and says that UN negotiations 'never rose over the level of awkward diversion for the US administration'. Although he admits that 'honourable decisions' were made to remove the threat of Saddam, the opportunities of the post-conflict period were 'dissipated in poor policy analysis and narrow-minded execution'.
Regarded as a career diplomat of impeccable integrity, during his time in post-invasion Iraq, Greenstock became disillusioned with the Coalition Provisional Authority, led by Paul Bremer. Their relationship had deteriorated by the time Greenstock returned to Britain.
The decision to block the book until Greenstock removes substantial passages will be interpreted as an attempt by ministers to avoid further embarrassing disclosures over the conduct of the war and its aftermath from a highly credible source...
http://observer.guardian.co.uk/politics/story/0,6903,1530311,00.html