Get A Hold Of Yourself was written by Ray and Elaine Adams. They also wrote The Sun Is Coming In with Valerie Avon - all three were members of the pop/MOR group The Avons. You could contact Elaine through her booking agency (link here) to see if she can give you any more information.
If the Dick Charles recording was a demo, then why does it have (what looks like) a matrix number? From my experience, that's unusual.