Britain's Greatest Codebreaker

Ed Stoppard

Alan Turing

Henry Goodman

Franz Greenbaum

Paul McGann

Himself - Narrator (voice)

Asa Briggs

Himself - Codebreaker, Bletchley Park

Jean Valentine

Herself - WRNS and Bombe Operator, Bletchley Park

David Leavitt

Himself - Alan Turing's Biographer

Rolf Noskwith

Himself - Codebreaker, Bletchley Park

Dermot Turing

Himself - Alan Turing's Nephew

Christopher Morcom

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

Ian Stewart

Himself - University of Warwick (as Professor Ian Stewart)

Clare Beavan

Director

Craig Warner

Writer

Jennifer Beamish

Producer

Clare Beavan

Producer

Ryan Greenawalt

Executive Producer

Patrick Sammon

Executive Producer

Paul Sen

Executive Producer

Edward White

Music

Rob Goldie

Director of Photography

Andy Jackson

Director of Photography

Nic Stacey

Director