just followed the buy now links on http://www.google.com/phone/ and discovered expansys who sell sim free and unlocked google android mobiles in the UK:
- acer £140 android expansys.com/acer-liquid-metal-brown-209791/
- htc £190 android expansys.com/htc-wildfire-s-209273/
- lg £400 android expansys.com/lg-optimus-black-209220/
and even the google android 4 ice cream sandwich
- samsung £520 expansys.com/google-galaxy-nexus-16gb-black-224319/