You can see the original pages of all three Bunting manuscripts at the IMSLP site. (search for IMSLP Edward Bunting) It's free, but you have to deal with old typography.

I doubt if anybody actually knows what Bunting did or did not do to any given piece of music. I think that if you like a piece, you should play it. And if something sounds all wrong, make it right.

Of course, this assumes you have been listening to traditional music enough to know what it usually sounds like. Most people here would qualify, I'm sure.