Mr Hoon named Dr Kelly when he wrote to Mr Davies for a second time on 9 July in the hope that the BBC would confirm that the scientist was Mr Gilligan's informant. But both letters failed in their attempt to persuade the BBC to reveal the identity.
In his appearances before the inquiry, Mr Hoon has not taken full responsibility for the letter to the BBC chairman. He simply confirmed that the idea to name Dr Kelly in the letter came from Mr Powell after "some discussions between Downing Street and the Ministry of Defence" on its contents.
Earlier, a colleague of Dr Kelly broke down in the witness box as he described how the scientist asked him to accompany him to his appearance before the Commons Foreign Affairs Select Committee.
Patrick Lamb, the deputy head of proliferation and arms control at the Foreign Office, stumbled over his words as he recalled that he had previously not been sure of Dr Kelly's view of him.
"This was the first occasion when it was clear he valued my opinion and had a certain respect for my judgement and would have appreciated my personal presence at the hearing," Mr Lamb said.
He said he had wanted to do everything possible to help Dr Kelly to prepare for an ordeal that was "analogous to any order he had experienced in the former Soviet Union or Iraq".
But Mr Lamb stressed: "I had no inkling or foreknowledge of what would follow."
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INDEPENDENT
Hutton inquiry website
British Parliament Foreign Affairs Committee transcript:
Evidence of Dr David Kelly
Key players in the 'sexed-up dossier' affair
Herald Feature: Iraq
Iraq links and resources