Bletchley Park: Code-breaking's Forgotten Genius

Steven Mackintosh Himself - Narrator

Brian Deacon Gordon Welchman (voice)

Rosamund Welchman Herself - Gordon Welchman's Daughter

W. Gordon Welchman Himself - Ex-Head of Hut 6, Bletchley Park (1939-1941) (archive footage)

Sinclair McKay Himself - Author, 'The Secret Life of Bletchley Park'

Jimmy Thirsk Himself - Veteran, Hut 6

Asa Briggs Himself - Veteran, Hut 6

Jane Fawcett Herself - Veteran, Hut 6

Tony Comer Himself - GCHQ Historian and Former Analyst

John Naughton Himself - Vice President, Wolfson College, Cambridge (as Prof John Naughton)

John Scarlett Himself - Chairman, Bletchley Park Trust, and Former Chief, MI6 (as Sir John Scarlett KCMG OBE)

Jennifer Welchman Herself - Gordon Welchman's Granddaughter

Robert R. Everett Himself - Former President, The MITRE Corporation

Eric Ellingson Himself - Gordon Welchman's Colleague

Larry Hill Himself - Gordon Welchman's Colleague