The late Prince Philip and the Queen also communicated with UFO believers a number of times, as he explored his interest in the fascinating topic, a new film suggests.

King Charles has an ongoing fascination with UFOs and the possibility of alien life, a new documentary has sensationally claimed.

The documentary ‘The King of UFOs’ also explores reports of the monarch’s inherited secret library of books and files on the phenomena plus other subjects such as crop circles and the paranormal.

It also suggests the late Prince Philip and Queen Elizabeth II communicated with UFO believers several times.

And now King Charles is exploring his own interest in the fascinating topic, according to the documentary.

One of the most bizarre claims made in the new production is that the then Prince Charles was seen piloting an experimental “UFO-style craft” in Canada in 1975.

Ufologist and filmmaker Mark Christopher Lee said: “Retired Police CID detective, and now owner of The Great British UFO Learning Centre, John Hanson had regular correspondence with Prince Phillip and The Queen and states that they had their own library of UFO and paranormal books.”

He told Express.co.uk: “Letters between Hanson and the Queen and Prince Phillip, shown in the film, say they will ‘add the book that John sent to them to their own collection/library’.”

Nick Pope, who investigated UFOs for the UK Ministry of Defence (MOD) until 2009, said: "The Royal Family has been interested in UFOs for decades, but this was also a matter of extreme sensitivity as in some ways, the situation was almost counter to the government’s position on this, or it was difficult to gel with it.

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"Prince Philip was very much at the forefront of royal interest in this, although arguably, he was introduced to this by Earl Mountbatten, his uncle.

"(Prince Philip) had a large collection of UFO books. He subscribed to Flying Saucer Review and a number of other publications, but it was all done carefully, so not to take a subscription and say ‘please send to Buckingham Palace.’

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"As well as looking at an alleged UFO landing and alien visitation on Lord Louis Mountbatten’s estate in England (allegedly witnessed by one of his own employees), the film investigates the late Queen and Prince Phillip’s interest in UFOs and crop circles.

"The film has exclusive access to unreleased archives and interviews with witnesses and also explores the extraordinary claims that the then Prince Charles piloted an experimental UFO craft in Canada in 1975.

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Previously: Wild claims King Charles ‘flew UFO to save lives’ in secret military mission