We already have a surplus unskilled working-age population in the country though.The problem being that as the population ages, we wont have enough workers to function. Already we're already woefully short in the care sector and if not for foreign workers it would already have fallen apart.
Maybe an answer is more targeted immigration.
What is needed is the current population already here needs to be targeted in being trained towards addressing the current shortage in skilled sectors of employment, rather then just increase immigration while crossing our fingers that a percentage of them have the skills required for the skills shortage while increasing the surplus unskilled population which causes more problems than it solves.