A cleaner at the Old Bailey (the Central Criminal Court) acted as a stand in for Michael Crawford putting the Crown Jewels in the Scales of Justice.
Film debut of Kenneth Colley.
The title song is performed by Peter and Gordon.
While filming a night scene in Piccadilly Circus, director Michael Winner set off an unannounced smoke bomb, causing horrendous traffic jams, after which he sped off in a taxi with the film magazine, leaving other members of the crew to be arrested. This incident caused such resentment that for many years afterwards permission to film there was denied; John Landis' An American Werewolf in London was the first to be allowed to do so.