Nigel Denver and I travelled extensively throughout Europe and Scandinavia during the early 1960s, crisscrossing borders without any hassle with a guitar and bagpipes.The only time we had trouble was in Paris in 1961 when I was surrounded and pushed up against the wall by gendarmes who thought my (folded) bagpipes was a rifle.

Another point .. the rules don't apply between Nothern Ireland and the Republic so could one travel to Europe via the Irish Republic after entering through NI? Or is this affected by Shengen?