Training:
You haven't needed a licensed field for a couple of years now.
Maintenance:
the Cumbernauld schools used to get all their aircraft serviced at other airfields (ie Perth and in NI, if I recall correct).
Of course, one could try training with a microlight: ah, that has already been done.
Still, couldn't be a nicer view from "the office" to be training from Oban.