The IAEA said the some of the evidence presented to it about Iraq's nuclear program was fake. But it isn't clear if that was US or British, plus it's always possible they where simply passing on bogus information provided by one of their sources.
I would also put the attempts to link Saddam to 9/11 beyond the level of exaggeration. This claim has been made again and again by Bush, despite leaks from the intelligence services that indicate they don't think it's true.
Jay