- Ben Macintyre
- Self - Presenter
- Peternel Hankin
- Self - Girlfriend of Charles Cholmondeley
- Jeremy Montagu
- Self - Son of Ewen Montagu
- Patricia Trehearne
- Self - Section Assistant 17M 1941-45
- Stuart Hamilton
- Self - Home Office Forensic Pathologist
- Jean Leslie
- Self - Counter Intelligence Section MI5 1941-44
- Bill Jewell
- Self - Commander of HMS Seraph - Speaking in 2003
- Pepe Morales
- Self
- Simon Greenish
- Self - CEO Bletchley Park Trust
- Roger J. Morgan
- Self - Researcher
- Pete Noakes
- William Martin
- Lyndal Marwick
- Pam
- Annabel Capper
- Hester Leggett
- Stuart Saunders
- General Nye
- Jan de Lukowicz
- Bank Manager
