JJFlyer,
You do not say where you live; if you live outside UK (or if anyone else following this post does!) you will be able to reclaim the (17% ?) duty when you take it out with you.
I bought my laptop in USA, but had to pay the (un-refundable) Mass State tax of, I think, 8% on top of the price.
I suppose if I had been a bit more organised I'd have compared the price at somewhere like DXB
Yes, my trusty Dell has a "100-240v" supply, as does my Motorola Timeport (why the devil do people make some mobile phones with 100v or 240v only supplies? They are supposed to be
mobile 
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What Goes Around . . . . .
. . often makes a better landing