The best bit for me, as a linguist, was the fact that some of it was in Welsh (not that I know any) and it reminded me a bit of the Scandi series it was emulating. However it went on for far too many episodes. After about half way it could have been wound up quickly at any point. I lost track and interest in the council estate plot, which could have been left out in my opinion. There was also recourse to daft police incompetence to help protract matters.
