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By the way, as a followup to my previous comment, I searched through Casio's CT-S400/410 User's Guide for "410". It appears only four times, and never is there mentioned any difference between the 400 and 410 models, which tells me that feature-wise they are identical.

I've read that they are identical (or almost?), and that the only reason the CT-S410 exists is so that Guitar Center (and other stores as well?) can promise to beat any advertised price on the CT-S410 model they sell, while at the same time not being obligated to beat any price on the CT-S400. On the other hand, that doesn't explain why the CT-S410 seems to be the model sold in the UK, nor why both Guitar Center and Amazon advertise the their respective models (CT-S410 and CT-S400) at the same price: $249.