It's been a long wait for Line of Duty fans, but the opening episode of season six finally aired on BBC One last night.

Adrian Dunbar, Vicky McClure and Martin Compston all return to the cast, while Kelly Macdonald plays DCI Joanne Davidson, who leads the murder investigation team.

But one question was on everyone's minds after watching the episode: What exactly is a Chis?

Jennifer Gannon and Joe O'Shea joined us for our weekly TV slot with the answer to this and all of your other Line of Duty questions, and gave their thoughts on how last night's episode compared to previous season openers.