OTL they were right, and I doubt the presence of Iraqi chemical or even bioweapons would change those feelings. I would like to think that if nukes had been found (they wouldn't) the attitudes of continental Europe might have been more substantially changed, but I doubt it.
Dr. Obeidi (?) the leader of the Iraqi Nuclear Programme did have a centrifuge buried in his back garden and Iraqi diplomats were discovered meeting with the North Koreans to discuss trading missile technology. Then you have Hans Blix who said off the record he was convinced Hussein was hiding stuff from the inspectors. Its a bit OT but I've always been a little surprised Britain and America got so hyperbolic over the 45 minute dossier etc. Intelligence pointed to him actively craving WMDs (the centrifuge got buried for safety until finances and technology were in order according to Obeidi) and he was one of the world's most impressive genocidal nutters. Seemed there was plenty of motivations without 'bending the truth'.
In the UK, the Stop the War coalition wont shut up but finding a ready to roll arsenal will give Blair a pop and probably hurt the Liberal Democrats in 2005 as the anti-war party. Labour win a larger majority and Blair might be able to cling on a little longer.