The character of Jupp (Denholm Elliott) was based on disgraced Flying Squad commander Kenneth Drury.
The movie was filmed during November and December 1977.
John Thaw once said of this movie for its publicity: "The Sweeney really is your urban western. But the team, the cameramen and the director, are almost semi-documentary in style, and therefore you get much more sense of reality than you would in a studio set-up. And we never work in a studio."
There was a big buzz excitement for the cast and crew about travelling to an exotic locale like Malta for some of the filming.