Q 01/05

Who created and wrote every episode of Line of Duty?

A) Jed Mercurio

B) Chris Chibnall

C) Russell T Davies

D) Sally Wainwright

Answer · why

A) Jed Mercurio

Mercurio also directed some episodes and called the show a "revisionist commentary on 21st-century policing".

Q 02/05

What is the name of the anti-corruption unit at the heart of the show?

A) AC-9

B) AC-12

C) MIT-7

D) AC-3

Answer · why

B) AC-12

AC-3 and AC-9 also exist in the show's world; in series 6 Osborne plans to merge all three and cut staff by 90%.

Q 03/05

On which channel did Line of Duty first air in 2012?

A) Channel 4

B) ITV

C) BBC One

D) BBC Two

Answer · why

D) BBC Two

It became BBC Two's highest-rated series in a decade before being promoted in 2017.

Q 04/05

In which year did Line of Duty move from BBC Two to BBC One?

A) 2021

B) 2018

C) 2017

D) 2019

Answer · why

C) 2017

The move followed a restructuring of the two channels and the show's huge BBC Two ratings.

Q 05/05

Which character does Martin Compston play?

A) Tony Gates

B) Dot Cottan

C) Steve Arnott

D) Ted Hastings

Answer · why

C) Steve Arnott

Compston is Scottish and adopts an English accent for the role; his three-piece suits made the waistcoat a running joke.