Or maybe people who seemingly understood this "simple issue" forgot to see how the economy takes a hit, because of thousands of reasons, the middle class in GB

Or maybe people who seemingly understood this "simple issue" forgot to see how the economy takes a hit, because of thousands of reasons, the middle class in GB becomes less wealthy and thus has less money to pay for plumbers. And then maybe realize that it's all the same plus a bunch of downsides, but now the cheap Eastern Europeans cannot be blamed anymore.