How about just not ripping off UK customers?
I'd be rather more interested in a fair price in the UK to start with - current prices for Visual Studio Standard 2008 are 249.99USD on Amazon.com, and 256.48GBP (=400USD) on Amazon.co.uk.
Stuff your miserly 33%, and stop screwing us to the tune of nearly 100%.
And don't give us any crap about tax differences or translation costs either, the differential is way greater than either of those excuses can account for.