I've just been Googling the Celebrated Ratliffe Stout Band and realised that the time to collect obscure Seventies vinyl was in the Seventies. Thanks Al Whittle for your offer of the album but if you have a look at the price it might fetch (£165 for a good copy) you might want to put it on eBay.
Getting back to the main topic...
Synanthesia brought out a fine album of that name. It was labelled acid folk but I would call it that only when I want to tease Dennis Homes who has moved a long way from that sound.
And when it comes to folk rock Heavy Horses by Jethro Tull should get an honorable mention.