The problem is if you want a specific book NOT on Amazon UK, or Amazon somewhere else.
Smashwords has a great range of books, so has Gutenberg. Sometimes I (or someone else in <insert country> wants a specific book, so I have to buy it on Amazon and the SAME books are not on all marketplaces. Sometimes in error and sometimes a "Rights" issue and sometimes even local censorship (though that's not likely in the UK).
Also I don't even live in the UK, yet my main Kindle, if registered to my real outside UK address, can only be used to purchase Kindle ebooks in a different currency to my own and only on amazon.co.uk, so I think it's reasonable to buy the book that's not on Amazon.co.uk anywhere that has it. Piracy isn't reasonable. Some other marketplaces are worse for English titles, yet the Kindle owner might be a native English speaker originating years previously from SA, Australia, Nagaland India, Canada, Patagonia, USA, N.Z., Ireland etc. Or be from / in Scandinavia, Netherlands, Germany, Iceland, Malta, Cyprus, Israel, Hong Kong etc and want to read in English because there is no translation to their native language, or the translation is not good and they are practically bilingual with English.
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