Juno is having her BSS in the next two weeks: she hasn't moved in anger since 2012 although I hope this will change this summer, after all, if Lutine is being refurbed I gotta go boating somehow!
Last BSS we (that is the BSS examiner and I) removed all trace of the gas system, as it was a monumental fail otherwise, so she now has no gas at all. However she still has petrol and leccy: the petrol system is as was, and I can't see why it would fail, although I doubt the engine would start.
The electrical systems were largely non-functioning last time, only a few lights worked, and my guess is they are now totally non-functioning, not least because the batteries are flatter than a very flat thing. The wiring is as per the last test, which was passed, but is it better to leave everything in situ or whip out the batteries (and perhaps the cables as far as the fuse box) and deny all knowledge of a functioning electrical system?
I suppose I could go the whole hog and take the engine off as well...