That's not proven. The group which investigated said there were two sources, one of which was the forgeries, and the other was never revealed.
The British government has learned that Saddam Hussein recently sought significant quantities of uranium from Africa.
The statement was true, and recently a British Commission confirmed that was so. Days afterward, however, the US received forged documents about uranium sales from Africa to Saddam. (Documents, I should add that an Italian inquiry established were forged by a man working for French intelligence - apparently to discredit the good information upon which Bush and Blair had relied, and thereby to embarrass them.)