I might have an occasion to agree with you here Cameroni (it's rare, so I'm going to take it).
Most Brexiters were promised so much - more money for the NHS, taking back the UK's sovereignty (whatever that was), not to be controlled by those crazy, unelected bureaucrats in Brussels but most importantly, regaining control of our borders. The Leave campaign was fueled by lies, widely optimistic financial scenarios that promised untold wealth and the right to stop 'the illegals'. The whole campaign was driven by xenophobia (and at times downright racism) and to those that had little or no success in life, they were told it wasn't their fault but the brown guy arriving on a dingy fleeing a war-torn hellhole fault. And they fell for it - hook, line and sinker.
What these highly intellectual Brexiters found out though was we had shot ourselves in the foot in the most dramatic way possible by literally leaving the EU, our biggest trading partner and STILL had immigration problems because the average person arriving on a dingy isn't European, they're from Afghanistan or Syria or Ethiopia and the likes which are of course NOT in Europe. We stopped all those terrible French, Italians and Greeks from being allowed to work here but still had the same illegals as we had before Brexit but without the support of the EU to stop them.
So no change at all as far as immigration is concerned (in fact it's got worse) but now we also have the problem of losing 100 billion GBP A YEAR in lost output. https://www.bloomberg.com/news/articles/2023-01-31/brexit-is-costing-the-uk-100-billion-a-year-in-lost-output