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Thanks Mobius. I've just checked the order confirmation and yes, they have itemised VAT at 17.5%.
As I said, it represents under a fiver, which I wouldn't have quibbled about anyway, because if I cancelled the order and went somewhere else, I'd still have to pay the higher rate. I just like to keep an eye things.
Interestingly, when I asked about Kindles in John Lewis just before Xmas, they said they didn't have any in stock and wouldn't have any until January. I guess because even if you pre-order from JL, you wouldn't pay up front and would have to pay the higher VAT when it's in stock.