Nice bit of research for anybody who has the time and inclination.
Much of the unused actuality which was recorded for the Radio Ballads survived, both in Charles Parker's and Ewan and Peggy's personal archive - I assume Charlie's is in Birmingham, Ewan and Peg's is housed at Ruskin College in Oxford.
Some of it is spectacular stuff, particularly the Sam Larner interviews and some of the Miner's stories.
We were lucky to be able to access some of the latter for a C90 cassette of British and Irish storytelling we edited for Malcolm Taylor at The Vaughan Williams Memorial Library, ".... and that's my story"..
Don't know how the BBC feels about it nowadays, but it really should be made available to anybody interested in songs, storytelling and social history
Jim Carroll