Piers Gaveston Society: Founder of elite Oxford University club ridicules allegations David Cameron put his genitals in a dead pig

One of the group's founders says David Cameron was never a member of the group and therefore there was no need for an initiation ceremony

David Cameron has been accused of 'inserting a private part of his anatomy' into a dead pig's mouth (Andrew Winning - WPA Pool/Getty Images)

The extraordinary allegation that David Cameron once "inserted a private part of his anatomy" into a dead pig's mouth as an initiation into an elite Oxford University drinking club has been dismissed as “purely malicious gossip” by one of the group’s founders.

The claim was made in an inflammatory new book, co-authored by Lord Ashcroft, the former deputy chairman of the Conservative party who fell out with the Prime Minister after he failed to make good on an alleged promise to give the prolific Tory donor a top job once he entered Downing Street in 2010.

But Valentine Guinness, one of the founders of the debauched group called the Piers Gaveston Society, said this morning that Mr Cameron was never a member of the group.

He told the Spectator it was “a ridiculous story,” adding: “As far as I know David Cameron was never a member of the Piers Gaveston Society, so there would have been no need for an initiation ceremony.

“He may well have attended one of their parties, but the pig’s head story is purely malicious gossip.”

Toby Young, an author, columnist and a contemporary of Mr Cameron's at Oxford University, said he had spoken to members of the Piers Gaveston Society who "weren't particularly discreet about what they and their friends had got up to" but none had mentioned the allegations made about Mr Cameron in the book.

"If anything like this had happened I think I would have heard about it," he wrote.

Downing Street refused to comment on the allegation, as well as staying silent on a raft of other claims made in the book, including accusations that he allowed cocaine into his London home, smoked cannabis with friends during his time at Oxford University and allegations that he misled the public over the non-dom status of Lord Ashcroft.

The Prime Minister's spokeswoman said: “I’m not intending to dignify this book by offering any comment or any PM reaction to it."

She added that the author "has set out his reasons for writing it,” suggesting the Prime Minister views the book as an act of revenge for his refusal to offer Lord Ashcroft a top job when he entered Downing Street in 2010.