I'm in Canada, I was in the UK for a few months and picked up the CE while (whilst) I was there. I installed it back in Canada thinking when I put in the CD KEY it wouldn't work....but low and behold it did. Steam recognized it and allowed me to play/auto updated everything.
Sooooooo, I'm not sure if that's the case in the US or not, but from a Canadian perspective...I can say 100% the UK English version of CLoD works perfectly fine with Steam (Canadian steam account)
