I think I am probably a bit late to the party and many will have seen this on various Internet channels, but if you have not then can I suggest you have a look at Berlin Station.
Series 1, which has just finished on All 4, was 10 episodes but it never seemed to drag at all. Every episode was fast paced and interesting. I don't think any of the cast gave less than a very good performance but Rhys Ifans was excellent.
If you need something to binge watch over Christmas/New Year, I cannot recommend it highly enough.