Jim-
I'm a bit confused about who has rights to what. In the US, Alan Lomax did most of his collecting while in the employ of the Library of Congress--that's a federally-funded institution. I don't believe that this gives me the right to copy and sell this material (much as I'd like to). Some of it's been licensed to Rounder; some other material is issued by the LOC.
    I suspect the same applies to collections funded by the BBC.