The British do police drama better than anyone. This series is one of their finest efforts. A talented ensemble cast navigate taut and intense internal police investigations. Each series builds upon the preceding series but focuses on its own strand of the corrupt relationship between Criminals and Police.
Plenty of red herrings and twists and turns to keep one guessing,
The pace is fast and often thrilling.
Series 5 not as good the others in my opinion but still watchable.