References to Siliconhell & Siliconheaven actually started in Series IV "The Last Day" when Kryten's replacement, Hudzen, arrives. Lister actually asks about Siliconhell in the episode.
"No Silicon heaven??? Preposterous!!! Where would all the calculators go???"
Siliconhell is where all of the bad electronic devices go. The ones that fail.
Sorry for the retentive correction but I love Red Dwarf.
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