I would be in favour of a bias towards live performance which is what folk music is all about- either on air or using pre-recorded session or concert recordings from the BBC Transcription Unit, but more interestingly - broadcasts from Folk Clubs, which might get some of them to pull their socks up. Just playing folk records is a waste of time, and talk can be equally boring if it goes on for too long.

As to where on BBC, well I suppose Radio 3 would be good, but heads and brick walls come to mind when squeezing in such a programme at a time when folks are not asleep!