As the hon. Gentleman knows, the operational rules that apply when an error is entirely the fault of the Department, and when the person involved could have had no knowledge of it, are the same as those in the tax system. He will know, too, that the system has always worked that way and that similar rules applied under the previous Conservative Government. When claimants give the details of their income, those details are played back to them in an award notice. They are asked to check that notice and confirm that the information is correct. The procedures that have been put in place have increased the accuracy of the notices enormously. The rules are perfectly fair, and they have worked for decades in the tax system.