Question: Who was the author that penned the 6th installment of a trilogy that originated on BBC Radio 4 as a comedy broadcast in 1978?
Sentence (from "I'm Sorry I Haven't a Clue"): The show launched in April 1972 as a parody of radio and TV panel games, and has been broadcast since on BBC Radio 4 and the BBC World Service, with repeats aired on BBC Radio 4 Extra.
Relevant evidence: No