Vicky McClure as Kate Fleming and Martin Compston as Steve Arnott Well, fellas, if you’re only interested in catching bent coppers, the season six finale pretty much did the job. It turns out that DCI Ian Buckells wasn’t just an incompetent middle-manager who failed upwards – he was also H, or the Fourth Man, the final OCG plant in the police force. But have we really seen the last of the BBC ratings juggernaut? Let’s hope not: there are still plenty of questions we need answering. And don’t you give us “no comment”, wee Jed Mercurio. 1. Is that the end of the OCG/police conspiracy?