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There can be no 'savings' for there never was any overspend. Accommodation is very seldom tailor-made to fix needs exactly. All this talk of it being 'unfair' to pay people for rooms they don't need is Orwellian "Doublespeak".
The huge added costs of administering this Benefit claw-back, similarly - for the reassessment of claims for those who downsize (or upsize), (mass) evictions - police & bailiffs, removal costs, B&B costs, the price of resultant stress and illness etc. etc., are only offset by the few that cough-up £14/week, and by so doing add greatly to costs elsewhere.
Of course, should any of the adverse effects of this policy lead to hardship, hunger or homelessness, well, it is after all a pillar of the Conservatives' ethos that individuals have the freedom to suffer. So, in fact with this suffering you are only getting from the Tories what it says on the tin.