With its jargon-heavy dialogue and whiplash twists, police drama Line Of Duty has always taken big risks. And they’ve paid off. As the massively anticipated sixth season arrives, Empire gathers the main players — past and present — for the ultimate interrogation. When Line Of Duty began there was, it’s fair to say, little fanfare. Season 1 appeared on BBC Two in 2012, and with its edgy, frequently brutal exploration of police corruption, it built a decent audience of almost four million. Nine years later, on the eve of the sixth series airing, Line Of Duty is the BBC’s most popular returning drama, with 12.69 million gripped by the 2019 Series 5 finale.