We bought one in San Diego this summer. I'd be surprised if you needed a power adaptor - most laptop's can work on 100-240 volts. You would need an adaptor plug - costs a £ or 2. E-bay is a good source - or Poundland.

Only issue I've come across is very minor keyboard changes between US and UK keyboards.

Thats great thanks Now to start looking for one

Yeah, US keyboards don't have a pound sign... but actually they sort of do. See, what Americans call the pound sign the British call the hash sign. And what the British call the pound sign isn't even on the American keyboard. You'll find the @ and " symbols are switched around too. It took a while for me to get used to but I eventually did!