Sorry for harping on, but I’m pretty happy with myself.
None of you will remember that I could never get Nano, or Joe or Vi working on my Slug – I never figured out why. But I just tried the trick I learnt above and applied it Vi, and it works! I can now edit the conf file directly on the slug without having to copy it to a PC first.
I did try Nano first, and it started to work, but then quit with an error about a missing library.
Anyway, I’ll shut up now, but hopefully this may help someone else.