In my hometown in Ireland, potato scallops were maybe the fourth most popular order after regular chips, curry chips and battered sausages. After leaving for Dublin, I found they weren't that widespread elsewhere in the country. Then I found them in a town near Leeds when visiting a friend. I don't think they were as popular there, as I had to explain the concept (basically battered potato slices) to my friend who'd lived there a good period of time, but was still glad to find them a little more widespread than my first post-moving out destination implied