THE PRINCESS (12A)

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The Archbishop of Canterbury called the 1981 marriage of Prince Charles, 32, and Lady Diana Spencer, 20, “the stuff of which fairy tales are made”. Whether it’s time to put aside such childish fantasies is the unspoken question of this uncomfortably compelling documentary.

Director Ed Perkins doesn’t seek fresh revelations about this ill-fated union. He just stirs our memories with a slickly edited collage of archive footage and old interviews.

Beginning with footage of paparazzi gathered outside the The Ritz in Paris in 1997, Perkins goes back to the early 80s to tell the story from the beginning.

A teenage Diana is making her way to her car as future ITN anchor Carol Barnes badgers her with questions about her rumoured engagement to the future king. The grainy film, Barnes’ plummy RP accent and Diana’s unguarded replies make it seem like it’s from a bygone era. When we get to the big day, the recent past really does seem like a foreign country. A newscaster relates how Diana’s family “vouched for her virginity” as crowds celebrate ecstatically in Trafalgar Square.

Interviews with the awkward couple feel just as surreal. Prince Charles’ strangled voice, static hairdo and odd mannerisms make him indistinguishable from his Spitting Image puppet.

As we follow the slow death of the fairy tale, Diana’s feelings become just as obvious. She’s utterly charming with members of the public but clearly distressed by the attention of the cameras.

At her funeral, Perkins invites us to stare at two traumatised young boys as they grieve for their mother. Were the media to blame as one furious member of the public later tells a camera person? Or are all royal watchers complicit?

In cinemas now