
I have a solution. We should only pay for the London house. But here's the cunning bit. We buy them a council house on a sink estate. Not to punish them, but to remind them how millions of people live. After a couple of months, I bet you'd find pressure on local services to improve absolutely everything!
This is the same reason why I suggested that the Supreme Court be based in Stoke, Birmingham or somewhere equally prosaic, rather than cossetted by gentlemen's clubs, fine dining, the old boys' network and corridors of power.