The film company said they set out to make an "insightful and compassionate study of Diana's later years".
But critics have called it "atrocious and intrusive".
Similarly Christopher Tookey's one-star review in the Daily Mail brands the film as "terribly, terribly dull".
"The movie is not as tacky or sensationalist as one might fear," writes Tookey, but concludes "the bottom of the royal barrel has been scraped once too often".
The Daily Express, however, counters the momentum, calling the film "a must see this autumn [which] will leave the audience in tears".
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