It being more expensive in Britain doesn't mean it doesn't work the same way (just come out with a lower price) elsewhere in the world.
From your electricinsights article:
> Most markets work in this way: Saudi Arabia’s oil is cheap to produce but gets a very similar price to higher-cost oil from the North Sea. The underlying economic principle is so widespread that it’s known as the Law of One Price.
OK, I get it. The UK is an outlier in outcome, but not in process.
But I still think there's something very British in insisting "Why, it's all above board, we play by the same rules as everyone else of course. We just get a worse outcome than anyone else because, well ... um ... look over there! Immigrants!!" (I'm not paraphrasing you, rather the country as a whole)
British exceptionalism at its finest.