This comment was made on another forum, looks like you might be out of luck and have to settle for YouTube.
“It was originally available on several compilations from the time ('Streetsounds #5' for the full-length version and a rather butchered version on a Ronco LP!), but rare as hen's teeth on CD...heaven knows who's got the master for it... ???“
I recall it was just called "It's Over"
If I get chance I'll look through some of the dance compilations which were around in 1983/84 or whenever it was