Bob Blair was selling CDr copies of the MacColl The Song Carriers radio programmes at Whitby Folk Week some years ago and I bought a complete set from him; not for what Ewan had to say but because of the opportunity to hear recordings of many of Britain's finest traditional singers. Generally these were not available at that time.
When I started to tell other people about the purchases, I was questioned about whether Bob was entitled to make and sell these and I didn't (and still don't) have the answer.