I thought we were talking about Wales, in particular your desire to concrete over green and pleasant Monmouthshire with housing estates and factories, which sounds a bit like Nimbyism as i don't think you live there ab.
There are disused factories around, which could be put into use again if you wish, and large tracts of land already under development around in the area - factories and housing- without building on productive farm land and AONB.
Building on the lush productive farm land and then having to import food seems counter-productive to me.
Anyway, I think that Monmouthshire and surrounding districts and Wiltshire are amongst the first to wecome refugees. I don't think there is a need to concrete over whole counties especially up the Sugarloaf Mountain.
As djen said in her Desmond Tutu quote 'do your little bit of good where you are' etc.