I've more than a dozen of his LPs and CDs and never tire of listening to him.
He both keeps alive the tradition by digging out old song and adds to the tradition by changing tunes and words when he feels something isn't appropriate any longer. Think of how often he has put a new tune to a song, how often he has made one song out of two, how often he has given a song another ending (when he didn't like the traditional and) or a couple of new verses when he felt the old version couldn't be sung any longer. Whatever he has done he always has described it in his notes. I never have seen him rewrite an old song and 'forgetting' to mention that as has been popular with others.
He deserves the praise, the MBE, and a long thread.