Himself - Remembrance Day Service (archive footage) (uncredited)
Prince Philip
Himself - Remembrance Day Service (archive footage) (uncredited)
Queen Elizabeth II
Herself - Remembrance Day Service (archive footage) (uncredited)
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Trivia
In the film's story, a series of three articles entitled "The Whistleblowers" are authored by Bill Pickett (Kenneth Colley) . The three stories were called (1) Culprits (2) Motivations and (3) Responses.
Some British movie posters for the film featured a long text preamble that read: "The Retired Serviceman. The Agent. The GCHQ man. The Civil Servant. They all know the identity of the country's most dangerous spy. But which one of them will finally blow the whistle?".
One of five movies that actor Michael Caine made with producer Geoffrey Reeve. The films include Shiner (2000), Quicksand (2003), The Whistle Blower (1986), Half Moon Street (1986) and Shadow Run (1998), the latter Reeve also directing.
Frank Jones had served in the Royal Navy for twelve years, but was wearing a Long Service and Good Conduct Medal; awarded for fifteen years' exemplary service. And the medal being worn was not that of the Royal Navy, but of the British Army.