Hi John,
A couple of years ago this same question came up and, because I've got a stack of Hi 45's, I remember thinking I must have had a spare issue (I certainly had a catalogue number on my Hi listing). Some months later when I checked, not only did I not have a spare, I didn't have an issue at all!
I had UK issues and UK demos and US Demo's of "Look At The Boy" but no US Issue. I bought the record as a new release and have played it out many times over the past 30 odd years, more especially at Soul Essence, in recent years, so surprised I haven't got an issue in there somewhere!
I remember someone said that Butch had some issue copies that he'd been selling at £30 or £40(?) which I would have thought would be a fair price.
I've got issues and Demos of the other Jean Plum 45's you mention (all superb) but, no LATB.
Knowing how you have an 'issue' fetish, I think it would make a tidy addition to your collection, mate, if one comes up!
Sean