That is extremely helpful - thank you very much. One detail - you mention that it coud be Amazon US who listed the book on their UK site - do you have any knowledge of this happening?
I'm a British writer based in the United Kingdom. I have contracted with a US publishers to publish a US edition of a book already published in the UK. The US publisher has listed the US version for sale on Amazon dot com. But he has also listed the U.S. edition for sale on Amazon dot co dot ...