The UK economy is already pretty small per-capita compared to other first-world countries. I'm certainly not one to argue for growth, but what is it about UK's conservatism that demands degrowth? It strikes me as antithetical to the liberalisation that I would think would form the right flank of the spectrum.
From my perspective, even economic concerns are driven by fear of immigration: it's just the same old "immigrants are taking my jobs but also somehow not growing the economy so I am now economically displaced" trope.
Britons do not, actually, wish to carpet their entire island w/ semidetached housing, so each and every immigrant occupying a flat is one less that a native could be living in.
From my perspective, even economic concerns are driven by fear of immigration: it's just the same old "immigrants are taking my jobs but also somehow not growing the economy so I am now economically displaced" trope.