Thanks to successive waves of immigration in the 20th century from India, Bangladesh, the Caribbean, Africa, China and others we actually have a pretty diverse and vibrant food culture.

OK, but the idea is that it's the indigenous food that represents the place in question. The Indian (subcontinent), Caribbean, African, Chinese, etc cuisines count as the food culture of those places, not british food culture.

Don't be like germans who are stupidly deluded enough to say "The döner was invented in germany" , when , no, it wasn't invented in germany, it was invented in the ottoman empire. Also, Hans isn't out back in the kebab shop busting his ass making that gigantic log of meat, it's Ahmet. If you want to argue that derived foods that are based on local ingredients are part of the food culture of that place, that's a more interesting debate that isn't cut and dry; no one is selling kapsolon made with gouda cheese in İstanbul, nor are they making Tacos al Pastor with pork and pineapples.

British food is good. Kinda simple, but good. Just not legendary. It's like a more mid version of itallian food; relies too much on fat and carbs and meat to feel delicious and satisfying, instead of advanced techniques or "just right" spice blends.