This was Dennis Waterman's last episode with the series. He was replaced by actor/comedian Larry Lamb as retired detective Ted Case.
Waterman expressed that while he liked the new cast he very much missed his original cast mates. He remained, he says, because his wife had just bought a new house in Spain where they had been on holiday. On his leaving, he said there was "no dust up" on the series, it was just time to move along. He found out one day that the series was ending from his driver. via interviews found on the internet.
Steve (Denis Lawson) asks Dominic Chapman (Garry Cooper) if his butler has a bowler hat with a steel rim. This is a reference to the James Bond film Goldfinger (1964) and the villain, Auric Goldfinger's henchman, Oddjob, who used his steel-rimmed bowler as a weapon.