An ex-British ambassador to Uzbekistan has published secret memos on his website which he says prove Britain has taken intelligence obtained by torture.
Mr Murray was outspoken during his two years in Uzbekistan
Craig Murray was recalled as ambassador in 2004 after voicing concerns about torture by the Uzbek authorities.
In a memo, he says a Foreign Office adviser said it was not illegal to use information obtained by torture but it could not be used in court.
A Foreign Office spokesman said the UK "unreservedly condemns" torture.
It has denied ever using torture to obtain information or inciting others to do so.
Mr Murray said he published the memos on his website in defiance of a Foreign Office ban on them being included in his forthcoming memoirs.
He told BBC News: "The UK government does accept intelligence got from torture abroad and the government is denying that.
"These documents are proof that I am telling the truth and they are not. I think it is a smoking gun."
The Foreign Office has not said what action it will take against Mr Murray over the publications.
Mr Murray began speaking out about torture within months of his appointment to Tashkent in 2002.
He was removed from his post in October last year after extracts from one of his memo appeared in the press.
He later resigned from the FCO in order to run against Foreign Secretary Jack Straw in his Blackburn constituency in the general election.