A former conservative MP has insisted he is "completely innocent" after he was questioned for a second time by detectives investigating claims he was involved in the murder and sexual abuse of children.

Harvey Proctor was interviewed under caution yesterday by Metropolitan Police officers working on Operation Midland, the inquiry launched following historical allegations of a VIP paedophile ring.

Speaking at a press conference in central London today, Mr Proctor laid out graphic details of allegations made against him by a man with the pseudonym "Nick".

He said: "They amount to just about the worst allegations anyone can make against a person, including the multiple murder of children, their torture, grievous bodily harm, rape and sexual child abuse.

"I'm completely innocent of all these allegations.

"I'm a homosexual. I'm not a murderer or a paedophile.

"This whole catalogue of events has wrecked my life."

Former Tory MP Harvey Proctor speaks during a press conference at St Ermin's Hotel, London, where he insisted he is "completely innocent" after he was questioned for a second time by detectives investigating claims he was involved in the murder and sexual abuse of children

Mr Proctor, who represented Basildon in Essex from 1979 to 1983 and Billericay from 1983 to 1987, was not arrested when he was questioned by police on Monday.

In a room packed with media, the 69-year-old said the complainant, "Nick", had stated he was "the victim of systematic and serious sexual abuse" by a group of adult men over a period between 1975 to 1984.

Reading from a police disclosure form, the former MP said: "Nick provided names of several individuals involved in these acts including Mr Harvey Proctor.

"He states Mr Proctor abused him on a number of occasions which included sexual assault, buggery and torturous assault.

"He also states Mr Proctor was present when he was assaulted by other adult males.

"Furthermore Nick states he witnessed the murder of three young boys on separate occasions.

"He states Mr Proctor was directly responsible for two of the allegations and implicated in the third."

Mr Proctor said one of the claims was that he threatened to castrate a boy with a penknife but was persuaded not to by another man, whom it was suggested was former Prime Minister Edward Heath.