Today, more than three decades later, he claims he was acting on the orders of some of the most senior figures of Margaret Thatchers government.
Anthony says he was a full-time political activist when he helped procure the youngest and prettiest boys for several cabinet ministers after being told to find entertainment.
In a series of explosive claims about conferences at Blackpool and Brighton in the 1980s, he alleges boys as young as 15 indulged in alcohol and cocaine before they had sex with the powerful politicians.
He says one person who attended a party is a current serving minister.
Others said to be present at the parties included Keith Joseph, Rhodes Boyson, Dr Alistair Smith and Michael Havers
As a young aspiring politician, Mr Gilberthorpe admits being in awe of the men, but now insists: They manipulated and groomed me to do their bidding.
He said: I was just 17 when I first went to a conference in Brighton in 1978. I couldnt believe I was rubbing shoulders with all these important people and I couldnt believe that they were taking such a keen interest in me. I would have done anything for them because I was so desperate to make it in politics.
During the years I was attending conferences between 1978 and 1985, I was a full-time political activist. At the same time I was running for office in district and county council elections.
Chris Davies / ArenaPAL Keith Joseph, British Conservative politician
Cabinet Minister: Former Education Secretary Keith Joseph
Mr Gilberthorpe claims that at the 1983 Blackpool conference he was asked by Dr Alistair Smith the Tory Party Chairman in Scotland to arrange for young rent boys to have sex with two high-profile cabinet ministers, who we are not naming today.
Other MPs at that party were said to include Rhodes Boyson and Keith Joseph.
In that week he presented the then-Prime Minister Mrs Thatcher with a cake to mark her 58th birthday. But he says he also had a more sordid role using his young looks to find these underage boys for her ministers.
At the time, the age of consent made it illegal to have gay sex with anyone under 21-years-old.
He said: Dr Smith, who I looked up to at the time and was the most important Tory in Scotland, told me to go and fetch some entertainment, which was code for young boys and handed me a handful of bank notes. There was about £120.
Mr Gilber-thorpe claims he was not shocked by the request.
He said: It was a norm and an open secret that these older members of the Tory party, like
Dr Alistair Smith, paid for young men to join them at sex parties.
It was the first time I was asked to fetch them but it was hardly surprising as I was becoming one of their trusted people. There was a well known and used cruising area close to the Imperial Hotel, which was a conference hotel. The hotel was not open to the public.
I was expected to find the youngest and prettiest boys. It was what those men wanted.
In fact it was all they wanted.
So myself and another Tory candidate walked down there and sat on some benches underneath an archway in the Pavilion area of Blackpool and waited.
Rex Lord Michael Havers
Attorney General: Lord Michael Havers
He said they were approached within minutes by a guy aged about 20 called James. He went on: I asked him if he wanted to come back to the hotel and he said yes. We asked if he had any
mates and he went away and came back with two boys who were aged about 15 and no older.
"It was a surreal situation as we were dressed in suits and ties and they were wearing jeans.
We said we would make it worth their while and the older one held out his hand and I passed him the money to share out. I promised him there would be plentiful amounts of free booze.
Mr Gilberthorpe claims he then asked hotel security to contact a man inside who worked at the Conservative Party Central Office to arrange for the three rent boys to be given security clearance and special badges that would allow them to enter the Imperial.
He said: All MPs, members of the National Executive and chosen delegates were given name badges that allowed you access to the conference hotel.
Some of them had a small Oscar sign in the corner which was a code to allow others to know you were allowed into these secret parties. He claimed the Hollywood-style Oscar symbol was actually in honour of gay writer and poet Oscar Wilde.
Once inside the Imperial, he says the group walked up several flights of stairs to a room where politicians were waiting for them, along with a table of cocaine.
Rex Boyson Rhodes at the Conservative party conference in Blackpool, 1987
In attendance: Rhodes Boyson at the Conservative party conference in Blackpool, 1987
He said: We took them straight upstairs and into a room where Dr Smith and other MPs were waiting for them at the party. They were given drinks and cocaine to snort and then they were all moved into the centre of the room.
Mr Gilberthorpe said he witnessed two senior Tories having sex with the boys. He said: A couple of other MPs were in the room. I can clearly remember seeing one politician, who is now a serving Tory MP, standing there and watching.
Mr Gilberthorpe also claims that two years earlier in 1981 he saw Sir Michael Havers then Attorney General at a swimming pool party at the Tory conference in Blackpool, where underage boys were encouraged to perform sex acts on several politicians, who we are also not naming today.
He recalled: In 1981 I was invited back to the Imperial Hotel by a Conservative councillor.
He was a big player in the notorious right-wing group the Monday Club.
We arrived at around midnight and I was led down some stairs to a door where two men were stood as security.
We were allowed to enter and I was led through a tiled changing room where there were piles of clothes strewn across the floor. We then walked into an area where there was a large pool and lots of men either stood around naked or simply wrapped in towels.
Among the MPs I recognised in there were Keith Joseph and Rhodes Boyson. I saw the Attorney General Michael Havers down there as well.
There were a couple of glass tables set up as a mini bar with bottles of spirits on them and there was cocaine on several tables. I saw several boys who were clearly aged between 15 and 16 down there and I saw that a few were performing sex acts on MPs.
Other young men were acting as waiters walking around with little black bow ties on. I was completely shocked by it because I was still only 20 and I had never seen anything like it.
He added: I stayed for a couple of hours but was tired because a conference was always a boozy affair where mainly spirits were drunk in large quantities from about 5pm onwards.
Dr Edward Alistair Smith CBE Request: Smith asked for young boys
Mr Gilberthorpe, now 52, says he also attended a sex party at the Grand Hotel in Brighton during the Conservatives 1984 conference.
On the night before the seafront hotel was hit by an IRA bomb attack, he claims he saw senior MPs engaging in sex acts with boys below the age of consent at a corridor party held in a row of rooms on the fourth floor.
He said: There were two guys on the door at the end of the corridor and because we were in the group I was allowed to enter. Several doors were left open and others were closed.
There were several men walking from one room to another and enjoying sex acts with other naked men, including boys who were clearly only about 15 or 16 years old. I saw Keith Joseph there and a politician who is now still a serving MP.
It was held on the night before the bomb went off and afterwards one MP crudely joked that it was a good job it was, or there would have been rent boys falling through the floor.
Mr Gilberthorpe, who decided to finally break his silence because he fears an Establishment cover-up, also claims that in the aftermath of the bombing, in which five people were killed, he was asked to look after two rent boys.
He said: I rushed over there from my hotel after I heard the blast and saw Keith Joseph stood outside in a blanket.
Yesterday he said: I was a teenager when I first met these men and they manipulated me and groomed me to do their bidding.
Because they were the most powerful men in the land, I was led to believe it was all OK. In truth they were abusers and once they had tired of me they simply discarded me. It is time this came to light before anyone else is abused.
They didnt think they were doing anything wrong and it was the norm then. They felt untouchable.