The headquarters of B.I.S.H.O.P. are in the Centre Point building at the junction of Oxford Street and Charing Cross Road. An architectural icon of 1960s London, the building was deliberately kept empty by property tycoon Harry Hyams for ten years as its value soared from £5m to £20m while not being liable for taxes as it was unoccupied. Gerry Anderson obviously decided the ideal location for a secret intelligence office was an otherwise empty building.
This was the last of Gerry Anderson's "Supermarionation" TV series, a format that officially began with Supercar (1961). After this, Anderson would only produce live-action programs for the next 20 years before returning to puppetry with Terrahawks (1983) (although he made an unsold pilot for The Investigator (1973)).
Gerry Anderson sold his shows to the then controller of ITC, the infamous, cigar-smoking, Lew Grade who syndicated them worldwide including the very large market of America. When Grade saw the pilot show he told Anderson to cancel any further development, despite a number of episodes already having been shot. He was horrified at the inclusion of Stanley Unwin and believed that the American audience would never take to him. Unwin had developed a gobbledygook language he called "Unwinese" which was a mixture of real words set out of context spoken quickly to confuse the listener. This was the last of Anderson's Supermarionation shows until the early 1970s with the pilot The Investigator (1973).
Most of the guest puppets were previously used in Captain Scarlet and the Mysterons (1967) and Joe 90 (1968).
The car, Gabriel, later appears in the 1st episode of Gerry Anderson's first all live-action show Alerte dans l'espace (1970) (Identified (1970))