Pentangle was such an absolutely brilliant band. My Geordie mom got me onto Lyndisfarne, and then my best friend in college started me on Fairport Convention. To me, English folk music feels incredible quaint. The subject always feels so small and personal by the way the music carries such emotion. I would say that Pentangle is the best of the the English Folk rock bands, and i would say the English progressive movement as a whole.
This piqued my interest. I'm a prog fan but I don't have any folk in my library beyond Jethro Tull's folk trilogy. I'll give it a listen.