Elenco - Britain's Greatest Codebreaker
Ed Stoppard
Alan Turing
Henry Goodman
Franz Greenbaum
Paul McGann
Himself - Narrator (voice)
Asa Briggs
Himself - Codebreaker, Bletchley ParkJean Valentine
Herself - WRNS and Bombe Operator, Bletchley ParkDavid Leavitt
Himself - Alan Turing's BiographerRolf Noskwith
Himself - Codebreaker, Bletchley ParkDermot Turing
Himself - Alan Turing's NephewChristopher Morcom
Himself - Christopher Morcom's Nephew (as Christopher Morcom QC)
Ian Stewart
Himself - University of Warwick (as Professor Ian Stewart)