I second the Foyle's War series, wholeheartedly. Michael Kitchen and Honeysuckle Weeks have such good chemistry. Not romantic, just great buddy chemistry and the storylines are just fantastic. I would also like to offer up River, with Stellan Skarsgard and Nicola Walker. Quirky, but very well written, and the acting is superb. Vera and Shetland are good. Not as sure about Shetland since DI Perez character has left, but the first few seasons are good. I also like Mcdonald and Dodds. McDonald and Dodds is a little more light-hearted on the surface, but the acting is good and the plots are well-written. There's always the Agatha Christie series, Poirot and Miss Marple. More comedic but still a good series, is New Tricks. Lots of comedy, but I like the idea of retired cops clearing up cold cases. There's one I'm still making my mind up about called Grace. It's from the creator of Endeavour. It has John Simm from Life On Mars, (another series I enjoyed,) first few seasons were pretty good, but the newest season is a little uneven imho. I'd be interested in any suggestions you have for British mysteries. We watch Britbox, PBS, and Acorn pretty much these days instead of the regular TV channels. Oh, if you get the chance to watch the Magpie Murders from PBS--it was terrific!