Forbidden Planet

(Did you mean the film or the New York bookstore?)

A British chain of SF/Fantasy/Comic bookshops. It used to be common for London Circle members to brandish a book they'd just bought from "FP".

Wikipedia article

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Store

Website

1978—

This is an SF bookstore page. When a floreat "fl." is listed it records the dates for which we have evidence and may not be the store's entire span.