A new documentary claims that Princess Margaret, the party-loving sister of the Queen, did have an affair with gangster John Bindon.
Titled ''The Princess And The Gangster'', the film gives out fiery details of the relationship between the royal, who at one time was second in line to the throne, and one of London''s most violent criminals, who also appeared in several "landmark" gangster movies of the late Sixties and Seventies.
"Together, Bindon and Margaret would create one of the biggest hidden scandals in royal history, one that, if fully revealed at the time, could have rocked the monarchy to its foundations," the Daily Express quoted the Channel 4 film as saying.
The film revealed that the two of them got attracted to each other on a trip to the evocative Caribbean island of Mustique, and allegedly shared a physical relationship as well.
One contributor, Noel Botham, the author of Margaret: The Last Real Princess, suggested: "He (Bindon) boasted to me that he had Margaret in Mustique, that she had given him the invitation to go to bed."
Princess Margaret was married to the "dashing and bohemian" Lord Snowdon, but the documentary says that "the dream royal marriage was a sham" with both having had affairs during the previous 10 years.
Margaret''s daughter Vicki Hodge, 62, was Bindon''s on-off girlfriend for 13 years and is also featured in the film.
And she claims that Bindon seduced the princess one night on the beach in Mustique, when she was there with them on his second trip there during the Seventies.
According to her, the Princess was instantly attracted to Fulham-born Bindon whom she describes as "tall, broad, with an air of menace, coupled with a boyish charisma that rendered him irresistible."
"When I saw them together, they were magnetised to each other, they were obviously involved. You could tell it in their body language. The fact that I was his girlfriend didn''t really matter. It was, ''Step aside, baby.'' Then there were calls from Kensington Palace and I began to realise there was a very clandestine relationship going on," she said.
"When he was drunk, he began to talk about it - where, when, how and what colour underwear she was wearing. He was a very physical man and she was a very physical woman and if they wanted a relationship, it was their choice," she added.
Vicki suspected that Bindon and his royal lover might even have been photographed while they were making love on the beach.
"I think that could have been their one dangerous moment," she said.
In fact, the Princess is even said to have asked for a "private view" of Bindon''s manhood after lunch one day on the island.
However, many close friends of the Princess always claim that she never had an intimate relationship with Bindon.
One former lady-in-waiting, who was with Margaret during both of Bindon''s visits to Mustique said: "She was certainly intrigued and amused by him, but there is absolutely no way they slept together."