Although this was the fourth story originally broadcast on ITV in 1972, it was actually the seventh story filmed. So when the series was re broadcast in the UK by Talking Pictures TV in early 2023, they chose to show the series in production order rather than the original broadcast order, making this the seventh story when re-shown.
For the 2023 re-run of this episode, the end credits for the third part of the story were used for all three programs. This meant that Diane Keen was credited for all three parts even though she only appeared in part three. And crucial characters played by Paul Alexander, John Malcolm and Dorothy Vernon were omitted from part 1 and John Graham and James Berwick from part 2.