An 85-year-old silent movie has been voted the greatest documentary ever made.

Man with a Movie Camera, shot by Dziga Vertov in 1929, charts life in three Ukrainian towns, with residents shown working and socialising in the Soviet state.

It has topped a British Film Institute (Bfi) poll of 300 critics and movie experts to find the best ever documentary.

Epic 1985 Holocaust film Shoah came in second place, experimental French movie Sans Soleil was third, and the top five was rounded out by Night and Fog, another documentary about the Holocaust, and crime film The Thin Blue Line.

Speaking about the winning movie, the Bfi's Nick Bradshaw tells BBC Radio 4, "It's part of a genre that was very popular in the 1920s. Filming cities, showing you the workings of them, showing you all the layers and intricacies that make up, typically, a day in the life of a city.

"This one has the extra layer of showing you its own filming... so as the title suggests you see quite a lot of Dziga Vertov's cameraman filming the city, you see the editor putting the film together, you see the audience coming into the cinema and watching it. It's a film about the city and about society, and about the world; it's also a film about cinema and what cinema adds to the world."