I just read this thread - http://www.flyertalk.com/forum/showthread.php?t=787640 - where it is stated that CO golds with EU addresses get ST lounge access when flying internationally.

Can anyone here verify that ?

I have addresses in both the UK and the US, and could reasonably/honestly switch my CO account to my UK address.

Would there be any downside of doing that ? Would I still get CO & NW domestic UGs just the same as with my USA address ?