Go see Pablo Larrain’s Spencer, which stars Kristen Stewart as Princess Diana, and the next day you will wonder: did I go to the cinema last night or did I have a cheese dream? Did she really clear the room of staff by saying she wished to masturbate, or was it the cheddar and crackers I foolishly had before bed? This is a total cheese dream of a film —did she really just eat a pearl? — but also it’s a riveting one as well as a thrillingly entertaining one.