I heard that this is referred to as the US version - am I wrong?
you mean the tim simenon mix? i think that was the prior mix to the commercial (arthur baker mix) release (possibly pre-charlotte) i know that this version was played live on tv just before charlotte joined. it is available on the 1977 deluxe edition and also on this site somewhere.
also, 'a life less ordinary' is the closing track on the u.s. version of nu-clear sounds but this is still the same mix as the commercial release.