Line of Duty Guest cast, played by Patrick Fitzsymons Episode 4x02: Episode 2 (Apr 2, 2017) Episode 4x04: Episode 4 (Apr 16, 2017) Episode 5x02: Episode 2 (Apr 7, 2019) Episode 5x03: Episode 3 (Apr 14, 2019) Episode 5x04: Episode 4 (Apr 21, 2019) Episode 5x06: Episode 6 (May 5, 2019)