I heartily enjoyed Peaky Blinders, the points you made about it are spot on. I am a huge Justified fan, so I always recommend that. Whitechapel as well, the first season is a retelling of the Jack the Ripper story but in our time. I really got into the British spy thriller show The Game, it was in the same vein as Tinker, Tailor, Soldier, Spy. Cerebral and lot so of plot development plus each episode had a HUGE twist that prompted a return to the show the next week. It's much better than most of the other spy shows out right now.