Maybe"Biscuit" was a diversion. It could have said "Hibiscus" for example.
Hibiscus would mean his clues of Biscuits/Good to dunk in your tea/Monmouth/Good savoury too are just the randomn utterances of a lunatic.
It's possible.
@Hairyback started
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Maybe"Biscuit" was a diversion. It could have said "Hibiscus" for example.