There is a version in the Helen Creighton collection, and the song is, I believe, well-known among Nova Scotian folkies of '50s/60s vintage. I would not be surprised if that's where Ian & Sylvia got it.

In the version published by Creighton, the 'ten thousand miles' verse is not. And 'bought', above, is 'but', which seems more natural to me.

Bob Dylan recorded it; probably from Creighton ... ?