The first English electric folk band may have been Fairport Convention. This is a 1967 performance of "Time Will Show the Wiser."
This clip doesn't really capture the best thing about the late Sixties iteration of Fairport - the vocals of Sany Denny who was to die of a cerebral hemorrhage in 1978 at the age of 31. Here is Denny singing "Gypsy Davey" with Fortheringay, a group she formed after leaving Fairport:
Another celebrated member of the early Fairport was Richard Thompson. Here he is playing "She Moved Through the Fair."
But the best version of that traditional Irish song is by the haunting Loreena McKennitt (who will get her own Sunday here in the near future):