The signature tune was arranged by Derek Goom using motifs and key changes from 'Prelude No. 2 in C Minor' from 'The Well-Tempered Clavier' Book 1 by Johann Sebastian Bach.
The character of Jean Darblay, the first woman inspector in a small-town Lancashire police station, was based on the experiences of Wynne Darwin, a real-life woman inspector in the Lancashire force.
Edward Peel (DCI Mark Perrin) revealed in a 2009 interview that he still received letters from fans of the series, 24 years since it finished.
The series was parodied in Whistling Calculus for Tax Purposes (1989) which Anna Carteret appeared in character as Inspector Kate Longton.