Benedict Cumberbatch has paid tribute to Alan Turing at the BFI London Film Festival opening night gala screening of his new film, The Imitation Game.
Cumberbatch plays Turing, a computer pioneer and mathematician who worked at Bletchley Park, attempting to decipher German messages to help end World War Two.
The actor told the BBC's Lizo Mzimba that Turing was a "national hero" and that he hoped the film would help bring Turing greater recognition.
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