When the 67th London film festival opens on 4 October, it will be with the international premiere of Emerald Fennell’s Saltburn, featuring an all-star cast including Barry Keoghan, Carey Mulligan, Jacob Elordi, Rosamund Pike and Richard E Grant. The “tale of privilege and desire” is the second feature from the Promising Young Woman director and follows an un-monied Oxford University student who becomes drawn into the beautiful and sophisticated world of a charming aristocrat. With its nods to writers such as Evelyn Waugh and Alan Hollinghurst, and its shots of sprawling country estates, Saltburn is a quintessentially British film. And...