The popular BBC show wrapped up four years ago, and fans are desperate to know if there will ever be another instalment after their disappointment over the identity of H.
Directed by Doctor Who writer Joe Ahearne, the psychological thriller also stars Scottish actor Richard Rankin and EastEnders actor Navin Chowdhry, amongst others.
The Scottish actor starred in the BBC police drama which last aired in 2021 after almost a decade on screens - with fans seemingly desperate to see more of him.
Line Of Duty star Stephen Graham, 51, plays Matthew Collins, a former member of several fascist and neo-Nazi groups who later became an activist for anti-fascist campaigns, including Hope Not Hate.