An excellent left-field slant on the sometimes tired cop-buddy genre. The partnership of Stephen Graham and Daniel Mays' has near perfect dichotomy, with Graham's character being the down-to-earth, pragmatic policeman, while Mays' "augmented" character has the best laugh-out-loud moments I've enjoyed for a long time.
I do feel, however, that the always brilliant Anna Maxwell-Martin is criminally (no pun intended) under-used in this third series. Let's hope that's rectified in the next (fingers crossed) series.