Oh, yes, Kendall. Scots or Scottish safest, and Scotch should be avoided nowadays as it is liable to cause offence, which of course nobody wants to do. I was simply pointing out that this is a fairly recent, and not entirely rational, development, in which many Scots have allowed themselves to be {over?]-influenced by English usage. Still, as the obvious wisdom has it: you can only start from here.

Best

~Michael~