Big steps forward on this tonight - stereo wired back in, leisure battery found to be dead, foam removed from the squab of the rock 'n' roll bed ready for replacement, fridge checked and run up - works fine, blown air heating checked and won't fire up, but fan runs, temp sender replaced on motor to bring gauge back working and probably a bunch of other stuff I've forgetten.
It WON'T be getting an ABF.