So Mallory Earl wouldn't let Hugh do his job? That's alarming. Analog multitrack machines need a lot of setting up, and if this is doesn't done correctly then you'll get all sorts of issues with the sound. I don't want to bore everyone with a lecture on multitrack recording but I can think of all sorts of nasty things that can go wrong when the standard procedures aren't followed. In that case it is the producer's fault after all! I'll stop giving him the benefit of the doubt...
There's definitely certain songs on Frenzy where the actual performance does seem pretty lacklustre and only the strength of the songwriting keeps you listening.
To get back a bit more ontopic... If Eddie can't find "Livin' It Up" on any of the tapes then maybe it can just be slipped on as a "hidden track" at the end of the remixed/remstered Frenzy CD (using the track off the '81 A&M release if that's all that is available). That would be a nice surprise.