Bletchley Park: Code-breaking's Forgotten Genius

Himself - Narrator

Gordon Welchman (voice)

Herself - Gordon Welchman's Daughter

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

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

Himself - Veteran, Hut 6

Himself - Veteran, Hut 6

Herself - Veteran, Hut 6

Himself - GCHQ Historian and Former Analyst

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

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

Herself - Gordon Welchman's Granddaughter