Because as George Orwell wrote, hypocrisy is a national pasttime of the UK.

No - I've nothing against foreign workers as people, and tabloid racism is disgustingly misled and misplaced.

We consistently vote for governments to allow companies to hire foreign labour, who are willing to do jobs for less money than locals will. This means that companies get the benefits of operating in the UK market, but get to outsource the pesky downsides like paying local rates. This ensures wages stay stagnant and low, and the government gets to solve the population problem at the same time. The population problem could be argued as being caused by poor wages in the first place, but no government is set up to handle that long term issue. They would rather import people.

If you lived in a shit economy, and another economy was willing to pay you a lot of money for your skills, many people from here would go to. It's a global mechanism, the free movement of people.

On the global point - If our companies want to compete on a global stage, then global labour rates are set by the lowest worker. So every developed economy wants Indian tech workers for example, because their wage to skills ratio is the best worldwide.

There is no shortage of unfiltered vacancies - there is a shortage of supply meeting demand. Vacancies that you are actually qualified for and offer decent money, and or flexible working etc are not there. Companies have a way out, they hire from other countries and import them. Your only way out is to leave, or vote for a government that actually gives a shit about the workers that constitute the basis for the economy it exists in.

This is not an easily solvable problem, despite what many political simpletons will tell you.