It's likely down to the fact that once the proverbial Polish Plumbers left, a lot of people realized that there's nobody here who actually wants to do that work, no matter the price. So we have no nurses, we have no truck drivers, we have no electricians. And the list goes on.

And it's impossible to import these people anymore, because a) the wages in the UK are low - lower than in most of the EU and much lower than in the US, and b) many of these professions are not really classified as high skill, even if they take a lot of practice.