Line of Duty Guest cast, played by Perry Fitzpatrick Episode 6x01: Episode 1 (Mar 21, 2021) Episode 6x02: Episode 2 (Mar 28, 2021) Episode 6x03: Episode 3 (Apr 4, 2021) Episode 6x04: Episode 4 (Apr 11, 2021) Episode 6x05: Episode 5 (Apr 18, 2021) Episode 6x06: Episode 6 (Apr 25, 2021) Episode 6x07: Episode 7 (May 2, 2021)