Andrew Marr and Benedict Cumberbatch
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Benedict Cumberbatch on Alan Turing and Bletchley Park film

The wartime work of the mathematician Alan Turing, at the nerve-centre of the code-breaking operation at Bletchley Park, is being brought to the screen by the actor Benedict Cumberbatch.

He spoke to Andrew Marr about Mr Turing's role in speeding up the end of World War Two, reports that the film had "glossed over" over his sexuality, and whether Coventry was sacrificed.

UK viewers can watch the full programme on iPlayer for 30 days from transmission

Go to next video: Cumberbatch: 'Turing was a hero'