Definitely...,had this discussion before and we all came to the conclusion that if a previously unreleased (or album track) tune got a legitamate release on 45 that it is considered an original release. Think 'Kent Anniversary' 45s for starters!
Basically, if you're a UK collector, surely you gotta get all the latest releases...i.e Soul City, Grapevine, Kent. You'll only be kicking yourself in the future if you dont!
Personally, (as a USA 45 collector first) I tend to go for the UK releases that never got a release anywhere else, this week I bought the 'Detroit Magnificents' and 'Al Williams' on Grapevine, both stunning tunes only available on vinyl this way.