With the exception of Digby, all the supporting cast were dropped after 1960, but two years later, Keith Watson and writer David Motton were allowed to introduce a new supporting cast, who remained with the series throughout the rest of its run.
All the supporting cast were dropped after 1960. This was with the exception of Digby. Keith Watson and writer David Motton were allowed to introduce a new supporting cast. This was two years later. A new supporting cast remained with the series throughout the rest of its run.