People of the Valley (1974)

Pobol y Cwm, "People of the Valley," has run since October 1974 and is the longest-running TV soap the BBC has produced. It follows the Welsh-speaking residents of Cwmderi, a fictional farming village, and is made at the BBC's drama studios in Cardiff Bay. This is the one to try if you're learning Welsh: everyday conversation at everyday speed, with a weekly omnibus that carries English subtitles. Nobody needs to start from the beginning; pick it up any week.