Endeavour (about Morse's early days in Oxford CID).
ETA: I can't believe I forgot about The Bletchley Circle! It was recently announced that there would be a second season, which I'm extatic about.
Love the Bletchley Circle! I can't wait for the next season.
I'm loving this thread, I enjoy British mysteries so much. I like Broadchurch, Whitechapel, and Agatha Christie. Not British but I also enjoyed Top of the Lake and Miss Fisher's Murder Mysteries.