Mea culpa! I'm the Tom Beveridge who reported Paddie Bell/Fureys album as being issued in "1963?". It was issued in 1968 (on Waverley, which by then had been taken over by EMI). Unfortunately, the Corries discography hasn't had a comprehensive update since I discovered my error.
The earliest Waverley version of "Come By the Hills" I've found is by Peter Mallan (an orthodox Scottish singer) in 1967.
Other info that's waiting to be published on the Corries Discography--there were different versions of the first three EPs (with extra tracks) and, did you know that Roy Williamson issued a couple of non-Corrie tracks during the 1970s?