A recorded interview between Dr David Kelly and a BBC journalist has been heard for the first time by the inquiry investigating the weapons inspector's death last month.
In the tape, Dr Kelly did not back up claims Downing Street communications director Mr Alastair Campbell was responsible for "sexing up" a British government dossier on Iraqi arms by demanding the inclusion of a claim that biological and chemical weapons could be launched within 45 minutes, the inquiry heard.
But he did dismiss comments on Iraq's weapons capabilities made by the British Foreign Secretary Mr Jack Straw and US President Mr George W. Bush as "spin".
Newsnightreporter Ms Susan Watts recorded the phone interview without Dr Kelly's knowledge the day after a Radio 4 report first aired claims the government put pressure on the intelligence services to make the dossier more compelling.
The May 29th report on the Todayprogramme was later revealed to be based on information given to its defence correspondent Mr Andrew Gilligan by Dr Kelly, Britain's leading expert on Iraqi weapons of mass destruction programmes.
But Ms Watts told inquiry chairman in London Lord Hutton that there were "significant differences" between what Mr Gilligan reported and what Dr Kelly told her.
She told the inquiry: "He didn't say to me that the dossier was transformed in the last week and he certainly didn't say that the 45-minute claim was inserted either by Alastair Campbell or by anyone else in Government.
"In fact, he denied specifically that Alastair Campbell was involved in the conversation on May 30th... he was very clear to me that the claim was in the original intelligence."
Dr Kelly had mentioned Tony Blair's chief "spin-doctor" in a separate conversation about the dossier earlier that month, but in a "gossipy, off-the-cuff, almost gratuitous" way which did not suggest he was offering an informed opinion, she said.