I get a lot of British programming from UK torrent sites. "Y Gwyll...aka Hinterland" is a Welsh crime/detective series. I noticed it's on Netflix. They have the first season. The second season is showing on UK tv now. Not sure if Netflix has the English language version or the Welsh language with English subtitles that I've seen.
The detective series "Lewis" has just started it's 9th season on British tv. I think it's been on PBS here in the past. "Vera" is an excellent detective program too. Based on the books of Ann Cleeves. Netflix has the first five seasons. Scott & Bailey is another good detective series. Netflix has the first 3 seasons. Also DCI Banks is available on Netflix.
The series Home Fires started on PBS recently. This series is about the women of a small English town during the early days of WWII. Bottom line, nobody does history or mystery like the Brits.
Thank-you for the suggestions. Be well!