It's not even that they don't use spices they just haven't even tried to evolve their cuisine. They still eat the same bland boring shit from 100 years ago. Meanwhile the rest of Europe thriving. It's like they opened the books once 50 years ago to let chicken Tikka in and then immediately closed the books again. They can always point to that one dish and be like see.
Is it Germany where you can only buy shnitzel, sausage and cabbage in various different forms?
Or Italy, where they're so proud of their food it's basically illegal to serve anything that isn't Italian?
Or France where spice and chilli is outlawed, only garlic and herbs allowed?
It's true that a lot of traditional British food is bland, but there are way more Chinese, Indian, Thai, mexican, Italian restaurants in any town in England than you'll find anywhere in Europe.