Court is in session in Yorgos Lanthimos’ The Favourite, a spectacular re-dressing of the period costume drama and savage comedy of manners about people who barely have any. It’s early 18th century England in Queen Anne’s palace. Off-screen, over on the mainland there’s a war with France to fund (there was always a war with France), but home is where the real hostilities are flaring up. Upstart crow Abigail Hill (Emma Stone at her most compelling) is the ruthless social climber cousin of the reigning royal favourite Sarah Churchill (Rachel Weisz), the Cheney-like whisperer who basically runs the country for the…