To me the Wordery arrangements seem a little troubling.
I understand that Wordery was launched by the wholesaler Bertrams of Norwich in order to sell direct to the consumer. This means that the independent booksellers who use Bertrams as their wholesaler, now find their wholesaler competing with them. It's hardly surprising that Wordery's prices are so often the lowest to be found.
I started using Wordery a year or so ago, after reading an article about them in the Guardian. I also assumed they were an independent bookseller, and being UK-owned, they seemed a decent alternative to Amazon. But I've been disappointed with them, because of slow dispatch and delivery, and a sometimes-unhelpful attitude. That finally sent me searching to see if I could find out why this company - who I hoped would prove an ethical alternative to Amazon - should be so dismissive towards customers.
I read about the company's background on the Bookseller site, which is where I learned that it was not an independent bookseller. And then I came across a discussion on the Amazon seller forum, about the difficulties faced by some of Bertrams' independent bookseller clients, faced with having to compete with their own wholesaler. (https://sellercentral.amazon.co.uk/forums/thread.jspa?threadID=70319)
Of course, this situation is actually a consequence of Amazon's dominance, which puts so much pressure not only on the independent booksellers but also on the wholesalers, who find their margins cut to the bone and are thus tempted to use their wholesaling price advantages to sell direct to the consumer at a lower price than any independent seller can match. Bertrams' one remaining wholesale competitor has aso launched a direct-to-consumer website (hive.co.uk). But they've gone about it very differently, inviting indepndent sellers to participate in the venture by acting as collection points. Seems a more ethical approach than Bertrams/Wordery. But I've only just learned of hive.co.uk, so I don't as yet have any firsthand experience.