On that note from jno, the Celts should follow Israel's example.
All the best real estate in England will be cleared of people and handed over to the ethnic Welsh, some of whom will be repatriated from USA, Australia, Patagonia etc to reclaim their Promised Land.
The present occupants of England will be housed in camps set up in Northumberland and Dartmoor. Some will be allowed to stay in a narrow strip of Kent, but will be surrounded by razor wire and minefields and checkpoints to ensure the territory is unsustainable.
The UN will condemn it but the Welsh will be able to ignore that because they will have the backing of their allies in the USA.
Yes, that should work.