Depending on your definition you could say folk-rock is one of the pre-eminent strands of popular music even today. 'Real' folk-rock was posited in a certain hairy sensibility that took cues from rock and folk but was very much its own thing.
I agree with Clueless Don on the Oyster Band, AOR would be nearer the mark. Bellowhead are much more folk than rock for my money. Some of the names bring back memories, Frogmorton and Gentle Giant both good bands. What about Stackridge?