Jennings was the scriptwriter for the first and second series, while Storm became script editor of the first series, co-writer for the second series, and screenwriter and script editor for the third and fourth series. Ray Boseley and Chris Anastassiades were also the writers for the third series, while Louise Fox, Christine Madafferi, and Robert Greenberg were assigned the fourth series. In addition to these, the second (1992), third (2000), and fourth series (2001) shared elements with the first regarding styles, characterisations, themes, locations, and genres with the original series. The third and fourth series were not based on Jennings' books but served as continuations for the former two series.
