Top Billed Cast

1. 

   Steven Mackintosh

   Himself - Narrator

2. 

   Brian Deacon

   Gordon Welchman (voice)

3. 

   Rosamund Welchman

   Herself - Gordon Welchman's Daughter

4. 

   W. Gordon Welchman

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

5. 

   Sinclair McKay

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

6. 

   Jimmy Thirsk

   Himself - Veteran, Hut 6

7. 

   Asa Briggs

   Himself - Veteran, Hut 6

8. 

   Jane Fawcett

   Herself - Veteran, Hut 6

9. 

   Tony Comer

   Himself - GCHQ Historian and Former Analyst

10. 

    John Naughton

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

11. 

    John Scarlett

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

12. 

    Jennifer Welchman

    Herself - Gordon Welchman's Granddaughter

13. 

    Robert R. Everett

    Himself - Former President, The MITRE Corporation

14. 

    Eric Ellingson

    Himself - Gordon Welchman's Colleague

15. 

    Larry Hill

    Himself - Gordon Welchman's Colleague