Me personally? No...
but I'll bet that Bush and Blair have a lot more reliable information than you, I, or the press. After all, Bush has the CIA, DIA, NRO, NSA, NIMA, and a host of other agencies in the Intelligence Community to draw upon.
Blair has the resources of British Intelligence to draw upon, and those agencies cooperate rather closely with our agencies.
In all probability, both Blair and Bush get additional info from the Mossad and perhaps other intelligence sources as well.