As soon as the intelligence is revealed publically the source is compromised, leading to
a) a dead source or one that has to be pulled out pretty bloody quick
b) no further intelligence
Thats what I meant by you have to trust the people that do see the intelligence. Thats the dilemma. I think I do trust Blair to do the right thing, but I'm far from convinced of the US administration, and they're probably the ones passing the info to Blair.