Just saw this on BBC News:

The memo indicates both leaders acknowledged it was possible no unconventional weapons would be found in Iraq before the invasion, the New York Times says.

The note cites Mr Bush suggesting three ways in which Iraq could be provoked into confrontation.

The US “was thinking of flying U2 reconnaissance aircraft with fighter cover over Iraq, painted in UN colours”, Mr Bush said.

Related to that “no WMD” point, I’d like to point out the following quote from Bush, made 24 hours before he declared war on Iraq:

Intelligence gathered by this and other governments leaves no doubt that the Iraq regime continues to possess and conceal some of the most lethal weapons ever devised. -George Bush March 18, 2003

Tony Blair also had this to say on the same day:

We are asked to accept Saddam decided to destroy those weapons. I say that such a claim is palpably absurd. -Tony Blair, Prime Minister 18 March, 2003