The first of two appearances by Elizabeth Richardson, the other being in S5 E16, A Man with a Fortune (1982).
The external shots of the office building ('Viking House') are of Marsh Insurance (as of 2021). Some shots are taken opposite this building next to Norwich Bus Station whilst others are shot from the rooftop of 'Viking House' itself to achieve the footage of the detectives rushing to the scene across the busy city centre road.
The first of two appearances by Richard Barnes, the other being in S4 E4, The Best of Everything (1981).