Dh is getting bored with me chuntering on about the way that the English British public has been gaslit about the dreadfulness of immigration 
Proper academic, peer reviewed studies demonstrated that EU citizens who came to the UK were net contributors to the UK economy 
So of course losing them has had a detrimental effect on growth - and is in itself contributing to the higher tax load. 
Plus of course the negative impact of Brexit 
Many of the immigrants that we're now needing are low paid, so won't themselves add much to the economy.
The UK is not "full". What successive governments have not done is invest in basic infrastructure (schools, roads, rail, housing....) that that net contribution of EU immigrants should have been used for. And then used the inevitable strain on services to demonise immigrants 
This has been a choice
Scotland, for example, is not full. A report recently suggested that a quarter of schools in the Highlands & Islands in the coming not many years may have to be closed thanks to falling school rolls. The same thing is apparently happening in some areas of England.
We have an aging population: who is going to earn on behalf of the country let alone wipe our bums?
Ds took the train to London yesterday: a long day trip with one of his clients who was visiting the civil service department that they deal with (who at least at the moment don't have their political masters on their backs 
) and also got given a tour of both houses of the Palace of Westminster.
He came back (getting muggins to pick him up from the train station and drop him off at his flat - but it was good 'cos I got a chance to chat with him) saying a) how incredibly small Parliament is and b) how beautiful the country (both of them that he went through ) is - and how much countryside there is - and how good the train is for getting a feel for that (and how helicopters and private jets insulate the party leaders from that).