Perhaps the most gripping British drama that I can remember of recent times. Many scenes are harrowing and you'll be crying a lot. But you'll be laughing at other times too. But mostly, you'll be holding your breath because of the sheer weight of the increasingly intense drama that unfolds. Stephen Graham has never been better and the writing is perfect for his incredible acting chops. And frankly, on this form, who's better than Graham? This is what TV drama is all about. Truly unforgettable.