I've really enjoyed the last 2 series, unfortunately can't find anywhere to watch the first 4 without paying, they don't appear to be on Netflix or Amazon.
Also BBC4 at 9pm on Saturdays nights is excellent, they show foreign crime drama throughout the year, just finished Darkness, those that...
Watching the first season of the Sinner on Netflix, quite good as you find out the killer in the first episode but have to find out why they did it in the rest of the series.
There is a scene between the 2 sisters in episode 6 which is a little disturbing though.
I've got one episode of Money Heist to go, a bit silly in places but great fun, apparently the most watched non English speaking program on Netflix and has been so popular they are now going to make another series, can't wait.