Britain's Greatest Codebreaker
Alan Turing
Franz Greenbaum
Himself - Narrator (voice)
Himself - Codebreaker, Bletchley Park
Herself - WRNS and Bombe Operator, Bletchley Park
Himself - Alan Turing's Biographer
Himself - Alan Turing's Nephew
Himself - Christopher Morcom's Nephew (as Christopher Morcom QC)
Himself - University of Warwick (as Professor Ian Stewart)
