Aye this was only several years ago. In a supermarket in Oban. Couple of young guys in front of us. The Ulster Bank notes are sterling UK notes just as Scottish ones are. The young guy on checkout just obviously didn't recognise them. Called the line manager who eventually came and confirmed they were ok. All very embarrassing for both the young tourists and the youngster on the checkout though. As I say there aren't that many UK banks that issue their own notes. It wouldn't be rocket science for big employers to work it into their basic training of staff. Different fair enough for small shops etc..