Made by Danziger Productions, Ltd. According to writer Mark Grantham (who received credit as "Norman Armstrong", producers Edward J. Danziger and Harry Lee Danziger "decided to make up fictitious on-screen credits for everybody involved", so as "to disguise their involvement" in the film.
Bowater House in Knightsbridge, shown as Robinson Enterprises office block, was built in 1958 and demolished in 2006. It was located at the junction of Knightsbridge and Sloan St in London, SW1.
Actor Brian Cobby was also a voice artist and from 1985 to 2007, became the first male voice for BT's telephone Speaking Clock.