Here are some of the unanswered questions viewers may have after watching… What was the full extent of Philip Osborne’s involvement in corruption and cover-ups? Just because Buckells was exposed as the OCG rat doesn’t mean everyone else is exonerated – quite the opposite. Instead, as Ted Hastings (Adrian Dunbar) explains to Patricia Carmichael (Anna Maxwell Martin), Buckells’s rise through the ranks was only facilitated by institutional failings that went right to the top. Ian Buckells (Nigel Boyle) comes clean in the Line of Duty finale (BBC) Exactly how complicit Chief Constable Osborne was in the various crimes and scandals AC-12 were looking at is still unknown; for now, it seems, he’s gotten away with his role in Vella’s murder. With Carmichael in charge, however, it seems likely everything will be swept under the rug.