An English teacher in a brand-new Hertfordshire secondary school is about to lose his rag. “You said ‘relaxed, like,’” he storms at a boy. “Why like? Like what? Why do you use that expression? What does it mean?” This is 1962. It’s a scene from Our School, sponsored by the National Union of Teachers, one of four documentaries made between 1953 and 1964 by John Krish in the BFI’s Boom Britain: Documenting the Nation’s Life on Film, a project that celebrates the neglected heritage of the post-war documentary.

This is the second part of a series that has passed a little too quietly for comfort. The V&A’s grand Diaghilev show has received all the noise in the press – “fabulous”, “sumptuous”, “exotic” – in fact, all the words that were used at the time to describe Diaghilev’s company. The only word that isn’t being used is “dancer” – we get relatively little chance to think about movement in South Kensington. However, Jane Pritchard, curator of that show, has now redressed the balance on the South Bank with a remarkable collection of films.

Of all the schools of film which were allowed to sprout behind the Iron Curtain, it was in Czechslovakia which contrived to export its work most successfully to the West.

Patagonia’s Welshness was a nagging issue for Gruff Rhys, mainman of Welsh psych-nauts Super Furry Animals. His distant cousin, the folk singer René Griffiths, was born in the desert-filled southern reaches of Argentina, but visited Wales and appeared there on TV in the mid-Seventies. Remembering those appearances, Rhys decided to visit Patagonia to search for Griffiths amongst the region’s Welsh-speaking community.

Soviet-era film director Sergei Paradjanov is a figure whose complicated biography has often overshadowed his innovative and distinctive cinematic style. The first full UK retrospective of his work at the British Film Institute on London's South Bank, marking the 20th anniversary of the director’s death, gives a chance to reassess the paradoxes of his heritage, and delight in a character whose rebellious passion for life and for artistic beauty brought him through some of the worst trials that the Soviet system could impose on an artist. Meanwhile, an exhibition of photographs by his long-term collaborator Yury Mechitov catches the last decade or so of Paradjanov’s life in his native city of Tbilisi, and shows the richly human face of so complex a personality.

The huge upsurge in interest in the Austrian author Stefan Zweig continues at the BFI Southbank when Letter from an Unknown Woman is revived next week. Shot by Max Ophüls in 1948, it beautifully captures the spirit of Zweig’s post-Hapsburg, pre-Freudian Vienna, where bourgeois lives are fired by romantic ardour and obsessive longing.