The Killing of Sister George (1968)

The weird thing about this "British" movie starring Beryl Reid, Susannah York, and Coral Browne (who was actually born in Australia) is that it is an American film, produced and directed by Robert Aldrich.  Based on a play of the period and set in London, it is the tale of butch lesbian Reid, a supposedly beloved character in a TV soap, and her childish lover played by a gormless York, and the ups and downs in their relationship as Reid's character is killed off by the Corporation suits.  Browne, a purportedly straight BBC executive, is enchanted by York and in a fairly explicit scene for the time contrives to win her for her own.  All three actresses are riveting, with special praise for Reid who plays a monstrous, controlling gargoyle with no vanity.  As a relatively early mainstream example of gay cinema, this film wins a place in movie history, but I doubt that it won many friends at the time of its release.