Call the Midwife! Great storytelling; sentimental themes overlaid over gritty realism; nuns in wimples saying complice of an evening: this show just hits all of my buttons ...
Also, I love British police and detective shows, and have recently been rewatching the George Gently series. Lee Ingleby as Detective Sergeant John Bacchus is absolutely brilliant, because he's not always easy to like (he's totally sexist, of course, and with some highly objectionable opinions concerning other members of the community), but he makes you like him anyway, he's that good.