David Cameron (British Prime Minister) put his man piece into the mouth of a dead pig

The Prime Minister carried out the act as a student a Oxford University, according to a claim made in a new biography.

The story was recounted to the authors by a contemporary of Mr Cameron who went on to become an MP.

He reportedly said the pig's head was resting on the lap of a member of the Piers Gaveston Society – a dining club at Oxford – while Cameron carried out the act.

He even claimed another member of the group has photographic evidence of the alleged act.

But the individual who is said to own the picture did not respond to approaches by the authors.