Production fell behind schedule, with some of the gasometer and safehouse scenes being delayed until after work on the next episode, Backtrack (1979) had already commenced. But by this point, Lewis Collins had broken his leg in a parachute jump. So the scene with Bodie uncovering the red Ford Cortina had to use one of the stunt team as a body double in the long-shot of him opening the garage door, while the following shot of Bodie talking to Cowley over the R/T had to film him from the waist up. Body doubles were used for the subsequent scenes of Bodie driving onto the site of the safehouse and scaling a wall.
During the climax,before Bodie takes to the stairs, as he's running into the building, he slips and fires wildly. Lewis Collins misstepped and the camera kept rolling.
Martin Shaw and Patrick Malahide would later appear in The Investigation: Inside a Terrorist Bombing (1990).