Why always Princess Diana? Kristen Stewart film Spencer is the latest to examine the life of the ‘Queen of Hearts’

• Spencer will not focus on her death, but imagines the scene at Christmas 1992 when a lonely Diana told Queen Elizabeth she wanted a divorce from Charles
• In portraying the ‘People’s Princess’, Stewart follows in the footsteps of Naomi Watts, Serena Scott Thomas and Emma Corrin. It’s Elizabeth Debicki’s turn next