The series was originally to have ended with the climax to the third season. However, the BBC One Controller of that time,
Bill Cotton, was so impressed by the quality of the series that he had the continuity announcer declare that Blake's 7 would return for a new series the following year, which caused some surprise amongst the cast and crew. Chief of the problems this caused was that producer
David Maloney had become producer on
"The Day of the Triffids" (1981), meaning that a new producer was needed for the show. After
Terence Dudley turned the job down due to his intending to retire,
Vere Lorrimer was made producer.
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