Once again , thanks to all who contibuted to this thread- the song is done, now, and was sung at the Kent concert of the Deal Festival last weekend...(Deal being one of the Kent communities with a miners' estate)... it's called 'I'll go down and you shall follow', and though it is a contentious subject it aroused no hostility. As there's a fair glossary to this song, I'll post it a bit later, but thanks again.
Bob