Even today, fish and chips is very popular.
But it is under competition. If you ask what the ADJECTIVE dish of the UK is, many people will say NOUN and chips. However, a lot of people would say roast beef and Yorkshire PLURAL NOUN. And even more would choose NOUN tikka masala, an Indian inspired NOUN that was created for British tastes!
Compared to the early 20th century, there is so much choice in PLURAL NOUN and restaurants. In my hometown, a small ADJECTIVE market town of about NUMBER people, there are NUMBER pizza restaurants, a nice Italian NOUN, four pubs that sell FOOD, three ADJECTIVE restaurants, three Chinese ADJECTIVE PLURAL NOUN, a Turkish restaurant, and probably some other PLURAL NOUN that I have forgotten about.
All of these compete against the two fish and chip PLURAL NOUN!