I thought that ruinously expensive houses were supposed to be a Good Thing. But never mind. Apparently not.
There must be a tax on the productive value of land per acre, other than that occupied by the homes of the less well off.
Perhaps, that would make possible the abolition of stamp duty. In any event, it would establish and enforce the principle that no one should own land other than in order to make use of it.
This was proposed by the underrated Andy Burnham when he was a candidate for Leader of the Labour Party. Do not take your eye off that man.