A second witness has already corroborated some of the information related to the case, lending weight to Nick’s claims and strengthening his credibility in the eyes of the police.
Nick has also told detectives about the death of another boy during a depraved sexual assault in the presence of a Conservative minister– a different MP to the one involved in the first killing.
Nick believes the car killing was a warning to him.
He says someone in the paedophile network deliberately ran over and killed a boy in broad daylight on a London street. He is convinced the perverts were demonstrating their power and showing what could happen if he spoke out.
Nick said his abusive father supplied him to a group of MPs and other VIPs who held abuse parties at Dolphin Square – an apartment complex in Pimlico, near Parliament – and at other locations in London.
He says the minister repeatedly raped him and other boys aged between ten and 14.
His claims are being investigated by police under Operation Midland, a strand of the Operation Fairbank inquiry set up to examine allegations of historical child abuse.
Exaro helped to arrange for Nick to pass his crucial testimony to the Met.
On Friday, the Met announced Operation Midland was now investigating “possible homicide”.
A statement said: “Detectives from the child abuse investigation command are working closely with colleagues from homicide and major crime concerning this information.”
Nick insisted a reporter from Exaro was present at a meeting with detectives when he gave them the name of the MP who allegedly murdered the boy, along with a list of other prominent people who he says sexually and physically abused him.
He also helped compile “e-fit” pictures of the murdered boys.
Nick went on: “There will be other people who know about the punishment and abuse carried out by this group - drivers of the cars who took the boys to venues, staff at the venues. Perhaps they can now come forward.”
He said he was taken to Dolphin Square at least ten times when parties were held. Different men would enter and leave during the evening.
Nick was around 11 when he first went there for a Christmas party.
He recalled: “We would be ordered not to speak to each other.
“Sometimes I would be driven there with other children. On other occasions I would be driven there alone and joined other children there.”
He described being led to a heavily curtained flat via several flights of stairs and a “dimly lit, musty” corridor.
And he added: “We were asked if we wanted a drink. It was always whisky. Both MPs were brutal. I was raped over a bath-tub while my head was beneath the water.”
He claimed one MP told him to thrash another lad and “sexually punished” him when he refused.
Last week we told how Nick, now in his 40s, had identified a shamed top diplomat and MI6 chief as one of his attackers.
He picked out a photo of Sir Peter Hayman – a former deputy director of the secret service.
Hayman, for many years a pillar of the establishment, caused a scandal when he was caught with paedophile literature.
Nick said Hayman, who died in 1992, was one of a group of men who raped him as a child.
He is satisfied police are taking his claims “extremely seriously”.
September 2012: Jimmy Savile outed as a predatory paedophile
October: Labour MP Tom Watson tells Parliament there is “clear intelligence suggesting a powerful paedophile network linked to Parliament and No10’
November: Rochdale MP Simon Danczuk claims in Parliament the late Lib Dem Cyril Smith was a paedophile. The CPS concedes Smith should have been prosecuted.
December: The People is first to reveal the Met are investigating claims youngsters were abused in the 70s and 80s at Elm Guest House in Barnes, South East London. Part of Operation Fairbank, into claims of historic child sex abuse by VIPs.
January 2013: We reveal details of the guest-list at Elm House, with spies, politicians and pop stars. A boy abused by Smith tells his story.
Getty ImagesHorror: The site of the former Elm Guest House in Barnes
February: First to publish an interview with a victim of Elm. He tells how he was dressed as a fairy before being abused.
September: A 69-year-old former headmaster arrested in connection with alleged sex abuse after People passes on information to police.
March 2014: We reveal how governments handed £70,000 to vile pressure group the Paedophile Information Exchange.
April: We tell how a former Elm worker claims he was raped there by an undercover police officer.
July: The disappearance from the Home Office of 114 files relating to historic child sex abuse, from 1979 to 1999, is revealed. Home Secretary Theresa May sets up inquiry into HO. Chairman Baroness Butler-Sloss forced to step down over actions of her late brother Lord Havers, attorney general in the 1980s.
October: Her replacement Fiona Woolf quits over links to Lord Brittan, Home Secretary in the 80s.
November: Met begins Operation Midland, on Dolphin Square claims.
Update: Telegraph publishes story about the murder of two children by Westminster pedophiles which the Police covered up. One the child of a Magistrate who disappeared outside Elm Guest House. The other the son of the Chauffeur of the Australian High Commissioner. Relatives silenced by Police intimidation for years are coming forward to find the VIP murderers of their children.