Wow. Just watched 3 in a row and could have watched the whole series. So good, it's like a cinematic experience. Outstanding writing, perfect casting all round, and exceptionally good and true acting, it feels like family. The entangled storylines, presented in a kaleidoscope so compelling, it makes you question your own integrity. You will need to know how this all ends. Gritty and brilliant. An absolute must watch from Channel 4.