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.
The Rachel Weisz film, The Whistleblower (2010), is not a remake of this film, despite the fact that both movies are thrillers, and both feature espionage. A key difference between the films, also is the spelling of their titles. Sounding exactly the same phonetically, The Whistleblower (2010) is spelled with two words where as The Whistle Blower (1986) has three.
GCHQ was originally known as the Government Code and Cypher School (GC&CS or GCCS), when it was first established after World War I. It was known by this up until 1946, when the name was changed to the GCHQ.
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?".
A large part of the picture was shot on location in Cheltenham, Gloucestershire, England, where the GCHQ is actually situated. Other significant Cheltenham locales featured in the film, included The Promenade, the Cheltenham Racecourse, and the Cheltenham Crematorium.