In 1976, Criminal Investigation Department's Detective Sergeant Alan Bruton, and Detective Constable Len Clayton were introduced, to inject new life into the twenty-one-year-old series (this was also the reason Dixon's opening and closing monologues were delivered in plain-clothes from his office, rather than the previously-used London backdrop). It was hoped this would broker a Dixonless series called simply "Dock Green". The idea was floated during production of what would become the final run, to decidedly unenthusiastic response.
Acknowledging George Dixon's advancing age at the time of the last season, it is said that his service has been specially extended in order to train Police Constable Harry Dunne as his replacement in the Dock Green Collator's office. (This was not, however, a job Warner's character had been specifically identified as undertaking previously.)
When Jack Warner died in 1981, aged eighty-five, his coffin was borne by officers from Paddington Green police station, where series Creator Ted Willis had done much of his initial research for the show in 1955.
The trivia item below may give away important plot points.
Andy Crawford features in all but the final run of the show. He is said to have transferred to A10 (the Met's anti-corruption branch) at the beginning of the twenty-second season. Series Producer Joe Waters did some preliminary work on a proposed Soho-based spin-off for the character (to be called "West End Central") which ultimately came to nothing.