For decades, the UK has produced so many high-class crime dramas, that it is impossible to "shoot without fail" all the time. Tastes develop, as well as circumstances, and viewers may move beyond the approaches and issues they used to like in Poirot or Morse, for example, or have begun to like "new age" in the form of Luther or Prey... Black Work is a kind of related mix, but worrying and grief overshadow other elements, including credibility, several male performers are too look-a-like, and the final 20 minutes or so add unnecessary sophistication.
True, Sheridan Smith as P.C. Jo Gillespie is catchy and the background realism is up there, but I am able to "blurt out" dozens of more interesting (mini)series I have seen in recent years. To me, Black Work is more a long film than series, and when you see all 3 episodes in a row, you could realise that many scenes and dialogues could have been more compact.