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David Cameron allegedly took drugs and enjoyed wild evenings with an Oxford dining club known for its debauched parties, it was claimed last night.

The sensational claims that the Prime Minister was in a “dope smoking group” called the Flam Club and took part in a debauched initiation, were made in an unauthorised biography Call Me Dave by ex-Tory peer Lord Ashcroft – long seen as a thorn in the side of the Tory chief – according to the Daily Mail.

The billionaire philanthropist has been at war with Mr Cameron for years and wrote the sensational biography after the Prime Minister allegedly failed to give him a “significant” job.

Sources close to the Prime Minister said they “do not recognise” the sensational allegations in a book by former Tory treasurer Lord Ashcroft after the pair reportedly fell out.

(Image: PA)

The book also alleges Mr Cameron put a “private part of his anatomy” in the mouth of a dead pig’s head in an initiation ceremony for the debauched Piers Gaveston Society.

But in the book both Ashcroft and Oakeshott consider whether the alleged pig incident is a case of mistaken identity.

They write: “Perhaps it is a case of mistaken identity. Yet it is an elaborate story for an otherwise credible figure to invent.

“Furthermore, there are a number of accounts of pigs’ heads at debauched parties in Cameron’s day.”

READ MORE:Tory peer and pollster Lord Ashcroft resigns from House of Lords

Sources close to Mr Cameron last night said they did not “recognise the allegations” in the book, published next month.

But it sheds new light on Mr Cameron’s journey from privileged student at Eton and Oxford to Number 10, via a career in PR where he made significant enemies. There is absolutely no suggestion of any wrongdoing by the PM’s wife Samantha.

(Image: Getty)

Mr Cameron was asked in 2013 if he had taken cocaine, during a Commons row about the drug use of disgraced Co-op boss Rev Paul Flowers . Ed Balls, then the Shadow Chancellor, heckled the PM with the question but he did not respond.

In 2005, after he was confirmed as the Tory leadership favourite, Mr Cameron said he had not taken cocaine since becoming an MP. Asked by Channel 4 News if had taken Class A drugs being elected to Parliament, he replied: “What is private in the past should remain private.”

Mr Cameron has previously faced claims that he smoked cannabis. A 2007 biography called Cameron, The Rise of the New Conservative, said that as a 15-year-old at Eton he was grounded after several boys were caught. He did not comment.

A Conservative Party spokesman said at the time: “David has always maintained politicians have a right to a private life before they come into politics.”

Lord Ashcroft and Mr Cameron reportedly have a rift going back to 2010 when the Tory peer admitted he was then not paying UK tax on earnings outside Britain. The book claims Mr Cameron was aware as early as 2009 that he was a non dom. Mr Cameron has previously said he did not know until 2010 about the tax status of a man who gave his party £8million.

READ MORE:Lord Ashcroft stays quiet over tax status

Lord Ashcroft stopped funding after 2010 and became an independent pollster , said to be viewed as betrayal by Tory high command because it helps their political opponents. The gulf is said to have widened in 2012 when Mr Cameron hired Australian polling guru Lynton Crosby as his campaign chief and Lord Ashcroft voiced his opposition to the appointment.

According to the book, Mr Crosby – who guided the PM to a shock outright general election victory in May – privately thinks he is a “tosser” and “posh ****”. Mr Crosby was not available for comment last night.

(Image: Reuters)

Sources suggest the decision to write the book – co-written by journalist Isabel Oakeshott – was launched out of “revenge”. Lord Ashcroft, 69, is said to feel “a lot of powerful people look down on him” as he did not go to Oxford and is self-made.