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An undercover cop probing VIP child abuse allegations at a gay sex parlour ended up raping a teenage boy, according to ­sensational new claims.

The victim, who was 16 at the time, has told how he was forced into sex work as a masseur at the Elm Guest House near Barnes in South West London in 1982.

Among the rich and powerful who he says abused him was disgraced former Liberal MP Cyril Smith.

Others said to frequent the guest house included a government ­minister, a high-ranking policeman, a member of the royal household, an MI5 ­officer and traitor spy Anthony Blunt.

Authorities were so concerned at rumours of a VIP paedophile ring that Met officers were sent in, undercover, to gather intelligence in 1982.

After a surveillance ­operation, ­police raided the property.

The couple who ran the Elm, Carole and Harry Kashir, were arrested along with the teenage masseur and charged with keeping a ­disorderly house.

But the charges against the boy, who was under the age of consent for homosexuals at the time, were later mysteriously dropped.

Now aged 49 he has come forward to claim that he was raped by one of the officers at Elm Guest House.

And he plans to sue Scotland Yard in what could prove an ­embarrassing court case for the police.

The ex-masseur, who now runs a ­successful photographic business, has also told how he feared for his life while being forced to work in the gay sauna and spa with its hugely ­influential client list.

He is reported to have said he was naive and struggling with his sexuality when his encountered the police ­approach. He says afterwards he was offered money.

The man says he was pressed into becoming a masseur after staying the night at the Elm without paying. He was allegedly told by boss Carole that clients included politicians and judges.

He reportedly said: “I ­remember Cyril Smith but I didn’t know he was a politician until I saw his puppet on Spitting Image.

“Carole told me not to let him in the sauna as he had got stuck in there before and they had to take the door off to get him oput.”

Referring to the alleged police encounter, he said: “One came round in the first month. He was early 20s, good-looking, not the usual sort who went to the house. He turned out to be one of the officers who later raided the house.”

The man added: “I am considering legal action against the Met.”

The Sunday People has been ­investigating events at Elm Guest House since November 2012, when Labour MP Tom Watson first raised claims in the Commons about an ­establishment cover-up of a VIP ­paedophile ring.

(Image: NEWSPICS LTD)

Yesterday Mr Watson, 47, told the Sunday People: “This is an explosive revelation and if it is true it is sure to be a further ­hammer blow to the ­credibility of the Met.

“It’s getting to the point where the public will not be able to trust anyone to get to the truth.

“I hope the Home Secretary will investigate whether a major trial was undermined by police misconduct.”

The latest revelations come after Labour MP Simon Danczuk published a book ­exposing child abuse by the former Liberal MP Cyril Smith.

The overweight politician regularly visited the Elm, where he was known as “Tubby” and once had to be freed after becoming stuck in a bath.

Mr Danczuk, 47, has spoken to the witness who was “very nervous”.

Afterwards a solicitor contacted the MP, who represents Rochdale, Smith’s old constituency.

Mr Danczuk told the Sunday People: “The solicitor said the reason he’s not speaking very much about it is because he’s taking action against the Met.

“He says the reason he’s doing that is because he was at Elm Guest House some years ago.

“He says that the Met acted as an agent provocateur when setting up the ­situation in the Elm Guest House. And the ­allegation is they raped him. He was 16 at the time so he was a child. And that’s the basis of bringing a case.”

Mr Danczuk said the ex-masseur claims prosecutors were told to drop charges against him at the 1983 court case.

“The police were effectively told, ‘Listen, drop the charges against this lad, you’re implicating yourselves.

‘You’ve gone in there as an agent ­provocateur and effectively had sex with this lad. You’re implicating yourselves in having ­committed a crime.’ That’s how he ends up getting dropped.

“He said he was worried about what had happened to Carole and thought she was murdered.”

Mr Danczuk said that during his initial conversation with the witness the man had a guarded attitude about what had ­happened to him during his time at the Elm Guest House.

The MP added: “He was jittery and not full of confidence. He says he did know Cyril Smith and I tried to get him to talk about him.

“He asked why we were not ­concentrating on another figure higher up the food chain who visited Elm Guest House.” This was a reference to a former Tory minister.

“He named him but I said we weren’t looking at him because the book is about Cyril Smith.”

Fears of a cover-up by police and the security services around events at Elm Guest House have led to frenzied speculation about goings-on there.

Owners Harry and Carole Kasir were convicted in 1983 for ­possessing obscene videos and ­keeping a disorderly house.

Carole died in 1990 in circumstances that are looking ­suspicious.

The 47-year-old was found dead in bed at her flat.

She was surrounded by ­injections and insulin bottles and had apparently left two suicide notes.

But an inquest later that year threw suspicions on her death and sparked fears of a cover-up that continue to this day.

Some campaigners believe she had photographs that could have implicated powerful figures in a sex ­scandal.

According to reports, an ­ex-boyfriend of hers, David Isset, admitted: “Carole said she had a load of photos of famous people doing stuff at the guest house.

“The name I remember is that of the fat man, Cyril Smith.

“She said she kept them in a strong box at the Royal Bank of Scotland branch in Richmond.”

Mr Isset claimed Carole told her she had been offered £20,000 for the pictures but thought they were worth more.

But the truth was never revealed before her death.

And some campaigners believe she could have been killed to ensure she took her secrets to the grave.