By chance, I found an old S4C series on our smart TV, called "Pengelli".
They seem to be running series 2, and there are some series 1 episodes. I could tell it was quite old by the lack of mobile phones, and the style of cars, and there was something about the style of production that dated it. Also, the lack of subtitles was a clue. I've noticed that revived old S4C series quite often don't have subtitles. I've wondered about that, and speculate that it might have been because originally, things on S4C were mainly aimed at first language speakers, rather than learners, and also perhaps, there was less appreciation of the needs of the deaf or hearing-impaired.
Anyway, I noticed several actors who either were in, or had been in Rownd a Rownd (e.g. "Philip", played by Maldwyn John) - all looking much younger. Most characters seemed to be northern speakers, so I guess it is set in north Wales, but I don't know where.
If I read the Roman numbers correctly in the copyright line, it was made in 1995 (which doesn't sound all that long ago to me, but - to my surprise - the arithmetic makes 23 years ago).
Does anyone remember this series from the first time around?