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Problem sorted out ! I actually ordered this on Ebay, after browsing on Amazon. I sent a message to the retailer on Ebay, asking them if they could shed any light on this mystery. It turned out that the retailer is away on a brief holiday abroad and had Amazon send the book to me, just to keep the business. The retailer did this on a tablet PC in her hotel room ! I am not sure if the extra copy was her fault or Amazon. So I will send the unwanted copy back to her directly.
There had to be a simple answer to this, as despite what I have said about Amazon, they have always been very reliable in the past.
I am looking forward to reading the book, as everybody has said how good it is. Just as soon as I finish the current "Blandings" book I am reading, I will give it a go ! Uncle Fred must come first !