I have just received this from the aforementioned Mr Callow:

This project was only even about playing along to traditional singers just as hobby....and is just an expression of my enjoyment of the music. A friend approached me to put in onto tape for some individually hand recorded tapes. Part of the point of this was to help people become more aware of traditional singers, rather than having the impression that the common perception of folk music is just about singing acoustic standards, and also to provide a bridge into discovering field recordings. I was in touch with Topic about this, and someone at the Alan Lomax archive and contacted the son of one of the recordists - who said it was ok to use a recording. I was trying to find out about some recordings that were attributed to Peter Kennedy (it appears he has put his name to some of Lomax's - but I can't be sure). I was doing all this to perhaps develop this into a proper project, but after seeing the legal minefield, I've given up on it. My bandcamp page is up, but nothing is for sale. I will with a heavy heart dismantle this project, sorry.