Well, i would prefer someone to back me up on this but i am 99.9% certain. You will have no troubles using a US console in the UK as long as you use a UK power supply. The voltage management all goes on in the brick, not the console. The UK/JAP/US consoles are all basicaly the same, but the bricks are slightly different.
I'm not so certain about the video standards though.
Google some stuff, see what you can come up with and report back, i'm sure someone can back me up on this.