I would agree with Ayin-- Masters practice their craft, and help their apprentices learn the "craft" of what they do. Paul Revere was a master silversmith; he didn't run a school in Boston teaching bowl making. The same with Henry Nock. He was a master gun maker, not someone running a school for gunsmiths.

Rather than write to the Lord Lyon or the College of Arms about this fellow's risible attempt at tradesman's arms, I would think that a letter to the Tailor's Guild in London, asking if this fellow is a member of the guild or in some way qualified to present himself to potential customers as a master tailor or master kilt maker, would be more in order. If one could be bothered to ask at all.