I assume this is a radio series, judging by the link.
I'm continually amazed (and that's not strong enough a word) how much BBC radio stuff there was, as in drama and comedy, even into the 1990s. I'd have thought all this stuff disappeared in the 1970s sometime, and even then it [radio drama/comedy] would have been on it's last legs. This seems to be a world I know little about. I guess I'm just amazed there was a demand for it, particularly at this "late" stage.
Lots of TV shows were adapted for BBC radio, many by the old transcription services for use abroad, mainly Commonwealth countries, though around 1967 there were a lot of cutbacks in radio & many shows were wiped but luckily there were many fans who taped shows off air so lots have been recovered..