The film, starring Kristen Stewart, is released in cinemas on November 5 - and the premiere took place last night. It explores the life of Diana, Princess of Wales, and her tragic death in 1997.

       Scenes such as Diana fantasising about throwing herself down a set of stairs, as well as fantasising about strangling herself with a necklace gifted to her by Prince Charles, have been met with critical reviews from commentators.

       Her sons, William and Harry, are warned they may find the scenes upsetting – as topics such as self-harm and eating disorder are included.

       Royal experts including Richard Fitzwilliams, Ingrid Seward and Penny Junor are among those criticising the film.

       Ingrid Seward, editor in chief of Majesty Magazine told The Sun: 'It is really cruel to portray her like this. It is totally unnecessary.

       “I know William was there when she was unhappy but it sounds to me the movie is factually incorrect.”

       Mr Fitzwilliams told MailOnline: "It was an extraordinary decision to feature Diana throwing up on the poster whilst dressed in couture.

       “The film does show scenes of bulimia and self-harm which is indeed cruel.”

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       Mr Fitzwilliams was in attendance at the BFI London Film Festival press screening of the film.

       He added: “I strongly doubt that either William or Harry will watch it.

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       “We have 20 more episodes of The Crown to come, which will probably also show disturbing scenes featuring her.”

       The movie comes following the release of ‘Diana: The Musical’ which was released on Netflix on October 1.

       The musical was mocked for some of the lyrics in the songs throughout, including “Harry, my ginger-haired son / You’ll always be second to none”.

       Mr Fitzwilliams added: “At least (director Pablo) Larrain only claims this is 'an imagining', 'a fable' and that is his right as a filmmaker.

       “But it is not dramatic enough to be good cinema and its appeal is centred on Kristen Stewart's portrayal of Diana which, though it has its merits, is badly flawed."