This is to be presented by James Naughtie and sounds brilliant.
What reason is there to be:

(a) xenophobic and
(b) such an inverted snob?

Church, court, stage, dance and drawing room/chamber music through the ages has always been drawn on and adapted by pub musicians, got mixed in with trad and has, in many cases, more or less become so.

There are two kinds of music: good or bad.
The first endures, the other doesn't.