This was a spin-off from Z-cars on the BBC circa 1975-1976. It had policemen in it, police cars and bad men who would get their comeuppance.
It was firstly broadcast in black and white from 1966, but was then rebooted when the BBC turned to color broadcasting in 1969. At that time it was also given a slightly new - not wildly different - name (Softly, Softly: Taskforce)
The main characters were, Detective Chief Inspector Barlow (Stratford Johns) and Detective Inspector Watt (Frank Windsor)
By 1972 it was looking a little old (it had been going 7 years!) but it continued until 1976.