Popeye's arrived in the UK recently, within the last 12 - 18 months. Yet to visit, but when I do I'll let y'all know on the other side of the pond what I thought.
Not sure tbh, most popular places are stuff like Mcdonald's, Buger King, Subway, etc. The issue is fast food out here is usually more expensive than "natural" food, so most people can't even afford it.