Are migrants or refugees all of one race? I suppose they are all of the human race....
And how are you paying for public services (local and National) with the diminishing tax base/increasing costs of an ageing population without
Roughly 6% of the UK is built on.
I suggest you further look at land ownership in the UK.
If we are all to live in dense urban conditions that is a matter of policy not geography!
You are aware that the government has pledged to build 300,000 houses a year I trust?
That is based in urban areas with vast swathes of countryside not being built on . And why the need to build so many more houses with a declining population?