British writer-director Georgia Oakley’s frank, searing and beautifully photographed debut follows a lesbian teacher facing homophobia at a pivotal point in British history. England, 1988: Margaret Thatcher’s Conservative government is about to pass Section 28, a law stigmatising homosexuality in education and forcing Jean, a P.E. teacher at a secondary school in the north-east, to live a double life. It’s crucial her employers don’t find out she’s gay, but at the same time, the secrecy is alienating her from…