We have an endless fascination with Diana, Princess of Wales, one which shows no signs of abating despite it being 24 years since her untimely death in that Paris tunnel at the age of 36. Earlier this year we were enthralled by series 5 of The Crown, and Emma Corrin’s portrayal of the young Lady Diana Spencer as she was courted, then married to Prince Charles, and now it it the turn of Kristen Stewart to play a slightly older Diana, one at the crossroads of her life with Prince Charles, in the weird yet beautiful film Spencer. Spencer is set over three days at Sandringham around 1991. It starts…