Britain's Greatest Codebreaker

Ed Stoppard

Alan Turing

Henry Goodman

Franz Greenbaum

Paul McGann

Himself - Narrator (voice)

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Asa Briggs

Himself - Codebreaker, Bletchley Park

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Jean Valentine

Herself - WRNS and Bombe Operator, Bletchley Park

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David Leavitt

Himself - Alan Turing's Biographer

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Rolf Noskwith

Himself - Codebreaker, Bletchley Park

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Dermot Turing

Himself - Alan Turing's Nephew

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Christopher Morcom

Himself - Christopher Morcom's Nephew (as Christopher Morcom QC)

Ian Stewart

Himself - University of Warwick (as Professor Ian Stewart)