Bev and Jerry:
I did not know that Sara Grey recorded McKenzie's version of it.
I have Sara's Sandy Boys CD which I found very enjoyable, so I'll be sure to put Back in the Airly Days on my "wanted" list.

Thanks for letting me know!

Still, as a field recording enthusiast I'm always most interested in hearing the "original" sources of the songs I like.

I'm not sure how to explain this, but for me, listening to a cover of a traditional song just isn't the same experience, even if it's well done.