Microsoft ripping off European customers?

Disregarding all the other pointless versions, Windows Vista Utimate Upgrade edition:

Amazon.com: $249.99 (£127.13)
Amazon.co.uk: $466.06 (£236.99)

Er, Microsoft. We’re not stupid! How about you come back here and re-price the EU editions of your (already overpriced) new operating system? Thanks.