With news this week that 'Line of Duty' is getting an extra episode this coming season, what better time than to go over some of the casefiles of AC-12?

We've pulled together thirteen questions from Seasons 1 to 5 and thrown in a few multiple choices for each questions, and all you've got to do is figure out which is the right one. Don't worry, none of the questions involve floating up the Lagan on a bubble or trying to decipher who 'H' is.

There's a 90-second timer on the quiz, so you'll need to move fast if you want to make it to the end of the quiz on time. No checking Google for the answers either, or you'll have Ted Hastings on the case.