That being said, the only UK foods I've had were made by expats here in the states. None of it was bland, with the exception of breakfast beans, "because they're meant to be mild to start your day" as I was told by a lovely liverpudlian.
She would do fish and chips, and the batter was well seasoned. Not heavily seasoned, but some pepper, a little paprika, and a bit of onion powder to give it some aromatic kick. Well balanced, and imo, as good as any of the southern fried fish recipes I've had.
The chips were obviously just salted and vinegar used per person.
But when we did pot luck at work, she would bring in what she called "good english food", which included some curry a few times.
But her shepherd's pie? Holy hell, that was some great stuff. She said it was really cottage pie because it was beef usually. But it had the usual pepper, onion, garlic, and herbs.
And the other expats I ate with were similar. Maybe different amounts of a given herb or spice, but it was in there.
I think the UK food thing is a meme in itself, and likely arose the way things usually do, with the majority of cooks just being bad cooks, rather than representative of a cuisine or the way things are done properly in that country.
I heard once that when spices became so cheap that even the commoners could afford it, the upper class in Britain started to claim that really good food doesn't need any spices to taste good and that bland food is the best. This supposedly made the British cuisine way blander.
I look at it the other way around. The food was so horrible, England sent entire fleets of ships just to get takeout from India. It didn't matter that it took months on end and people lost their lives along the way, it was still worth it.
If this is what a country's cuisine looks like to you, I think it says more about your choice in food than what is available from that country's cuisine.
Meanwhile, both the tomatoes in the baked beans and the potatoes used to make the fries/chips originated in the Americas and the guy who cooked it once experienced the taste of paprika. So there!
The only British person who actually knows how to use spices is Gordon Ramsey, and he gets a pass on not using them cause he actually knows how to cook good food.
Well we invaded Iraq and Afghanistan and Syria and several others while drone-bombing a few others 24 hours a day to spread democracy and not for their resources.
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.