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I suspect that the Guardian bookshop doesn't actually exist and that they just rent a book shop service from a larger distributor rather than having any stock.
I assume that the guardian just has to tick a box next to each book in the inventory that they want to offer to their readers. Might even be Amazon doing it tbh.
Edit: confirmed, they use Bertrams, the distributor owned by Aurelius Investments.
"It's a load of shite."
"Now available via our bookstore."