I’ve enjoyed every series of Line of Duty, but now it’s obvious it’s come to the point that Jed Mercurio is struggling to maintain the standard of earlier series. Wouldn’t be surprised if Mercurio wanted to leave it at that, but the ratings the series got probably means the BBC will want to flog the dead horse with at least another series. The way Buckells crapped himself when the solicitor got strangled in his cell makes it obvious he’s not H/4th man.