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BFI reveals 'greatest documentaries of all time'

1 August 2014 Last updated at 12:20 BST

A silent movie from 1929 has been named the greatest documentary of all time by the British Film Institute's Sight and Sound magazine.

Man with a Movie Camera was chosen after votes from 100 critics and filmmakers.

Award-winning documentary-maker Sophie Fiennes and Sight and Sound magazine web editor Nick Bradshaw discuss the results.

First broadcast on BBC Radio 4's Today programme on Friday 1 August.