Finally tracked this down on a CD after nearly a decade. This is the original version from 1984, featuring Dolly Parton on harmony vocals.
This was originally taken from the RCA album "Where Is A Woman To Go", which has never been released in a digital format. Two of the tracks were released on the CD "The Best Of Gail Davies", from where this was sourced. The version on her Greatest Hits album is a later re-recording which doesn't feature Dolly Parton.
The CD this came from has been deleted since the 1990s, so I'm sharing it with everyone. If whoever owns the rights to this track releases it in a digital format, I'll happily take this down.