In Australia, quite a number of our TV police dramas (ie. all of Crawford Productions' series) and soap operas could negotiate to "borrow" music (even for their opening credits theme music!) from a set of prepackaged instrumental tracks from what was known as the "KPM 1000 Series" music library, a British label, active from the late 1960s through the 1980s. All of the copyright permissions were already set up and the various productions only had to conduct a speedy transaction to use them. KPM's album, "Light Imitations - Vol. III", was very popular. The distinctive Track 4, "Paper Boy" (1968) by Stephen Gray, was to become very recognisable as "Theme from 'Number 96'" (1972-77).
That track was previously heard in a US movie, "Sometimes Aunt Martha Does Dreadful Things" (1971), and more recently an Australian TV commercial for "Toyota" (c. 2022).
The same soap opera's uncredited play-out music (before each ad break) was from a different KPM LP, "Beat Incidental": Track 5, "The Feminine Scene" (1969) by Alan Hawkshaw and Keith Mansfield. "The Feminine Scene" was previously heard in the Australian "Homicide" (1970) episode, "Wall of Silence".
Quite bizarre when such well-known music (in Australia) pops up in random places in older British and US series.