"And, as said here, while some Scots and Irish are, of course, performing the music of other nations, the percentages are nowhere near that of English folkies"

Prove it. Do you want to supply refs to back up this statement? No tradition exists in isolation, and the traditions of these Islands exist in a state of close co-existence and long may it remain so.

I showed an example, of just 3 Planxty CDs, which show Wav to be wrong. He hasn't commented on it.

Now Wav, do you think that just anybody would be asked to edit the revised edition of the Penguin book of English Folksongs?
And guess who is on the cover.