Gareth Hunt replaced Nicky Henson as Agent No. 1 - Charles Bind for the sequel Undercover Lover (1979). Henson joined the Royal Shakespeare Company and could not do the film. Henson had originally signed on to do three Charles Bind pictures.
The criminal organization's acronym name KRASH stands for "Killing, Rape, Arson, Slaughter, and Hit" and is a parody of the Soviet counter-intelligence organization SMERSH, which was used by James Bond creator by Ian Fleming.
First of three Agent No. 1 - Charles Bind spy spoof movies. The three films are [in order]: 1st: No. 1 of the Secret Service (1977); 2nd: Undercover Lover (1979); and 3rd: Number One Gun (1990).
The last name of the Agent No. 1 Charles Bind character is a spoof of the surname of James Bond.
The James Bond spy spoof film Carry on Spying (1964) featured a character called Charlie Bind (Charles Hawtrey).