The "minstrels gallery" as it was called, was removed from G-HLFT, I think, to enable it to carry sea containers. The Gallery was still fitted to G-BEPS, as was the full sized galley, and the crew rest bunks down below. All in all, a most agreeable way to see the world..........
The APU had a life of its own, and would often spit flames during its alarming start sequence. As has been said, it couldn't be started inflight, thank heavens.
If I remember rightly, the flight deck heating control was in the cargo hold, and the cargo hold ones were in he cockpit?
DH