Interesting...
I still think if that was true then we would see more camcorder manufacturers offering dual standard ones.
Other electronic items (e.g. digital cameras) which have no format issues are also cheaper in the US, and while some will import from there, I don't think it impacts that much on the UK market.
Prices tend to be as cheap or even cheaper in China which is PAL, so if you want to import you can import from there.
And I've found that lately the price differences are not that much if you take away VAT (which you should have to pay if you import anyway). US prices can look much cheaper sometimes when you see "rogue" traders advertising unrealistic prices... if you compare the UK price and the US prices from a quality vendor they are not that much different.... see this example for the HC3
SONY HDRC3 "whats the cheapest out there?"