A trawl through some of his possessions, left in Belgium when "Sexual Healing" was released, has unearthed a case full of tapes of previously unknown recordings made over there by Marvin.
A local lawyer now has possession of them all & states that one of them is a truly great track [[though he won't let anyone hear it).
Seems he's trying to get a record label to license these tracks for release, with a hefty advance being needed first of course.