I guess you've not heard of Lindisfarne then - not just an island off the coast of Northumberland - but also a 70's band that loosley (very they included a mandolin player) fitted into the genre of folk rock and sang their own compositions. Songs like Fog on the Tyne, Lady Elenor and Hey Mr Dream Seller ( a song about drugs if ever I heard one) being in the pop charts. They seem to be a bit on the revivalists list. Sorry never heard of most of the chaps you're talking about.