Ok, American camera gear isn't dodgy, it's all totally ligitimate, BUT it's a hell of a lot cheaper than it is in the UK (less that $ for £ in many cases)!
My question is, now that I have got your attention, "Is there any risk of buying Canon cameras and lenses in America when I live in England?"
Basically, I am planning to be in Vegas in February (I know, prices in Vegas are expensive, but B&H / Adorama, etc. ship to hotel rooms) and I am planning to acquire a couple of lenses and a body - camera body, not the usual Vegas type of "body"
Your odd voltage and her majesty's customs and excise issues aside, are there any issues with using "American" gear in the UK, such as waranties or support?