Things like this do change with use - look at how many songs turn up in variants at opposite ends of the British Isles. In this case, the Lorna Campbell version has a bit of a Scots lilt to the dialect, while the North Eastern band Prelude did a radio-friendly version with the dialect completely removed, a slightly mid-Atlantic twang, and rhymes changed to accommodate this. Personally, I prefer to hear the version that's been familiar up here (NE England) for decades, and, yes, Bob Fox's recording is about the most gorgeous I've heard too ... but that kind of judgement IS personal. Isn't it wonderful that if the lyric mutates enough you get a whole new song?