(PHOTO The Royals - "Gangsters in tiaras")

(May 14, 2011) The Royal Family masterminded the car crash that caused Princess Diana's death as a 'warning' to make her toe the line, a controversial new film premiered at Cannes yesterday claims.

The director, Keith Allen, said the House of Windsor had 'got away with murder' because no one had been held to account over the accident.

In the film, entitled Unlawful Killing, Prince Phillip is branded a 'Fred West-style psychopath' who 'orchestrated the murder' of Diana.

Allen, who is trying to sell the film around the world, was bankrolled by Mohamed Al-Fayed, whose son Dodi also died in the car crash, to make the movie.

He invested £2.5 million to back the production after it was turned down by every broadcaster in the UK.

It will not be shown in UK cinemas because of strict laws on libel and contempt, but Allen believes the movie will make money in America.

Allen said: ‘I think Diana was in a position to rock a lot of boats.