Last year, I wrote about a fascinating film that only had a short theatrical release, for my Long Take column in Sight and Sound – but now it will live for a year on iPlayer, and I think it is well worth your time. Three Minutes: A Lengthening is directed by Bianca Stigter and has a voiceover by Helena Bonham-Carter. You may recognise its subject from the book Three Minutes in Poland: Discovering a Lost World in a 1938 Family Film by Glenn Kurtz.