Britain's Greatest Codebreaker

Paul McGann

Himself - Narrator (voice)

Henry Goodman

Franz Greenbaum

Ed Stoppard

Alan Turing

N/A

Asa Briggs

Himself - Codebreaker, Bletchley Park

N/A

Christopher Morcom

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

N/A

David Leavitt

Himself - Alan Turing's Biographer

N/A

Dermot Turing

Himself - Alan Turing's Nephew

Ian Stewart

Himself - University of Warwick (as Professor Ian Stewart)

N/A

Jean Valentine

Herself - WRNS and Bombe Operator, Bletchley Park

N/A

Rolf Noskwith

Himself - Codebreaker, Bletchley Park