If and when the Secretary of State abolishes the poll tax and replaces it with his twin tax, what assurances will he be able to give to some of my constituents who live in a high-rated and high-value property in central London? The several adults who live in that property are either not earning or have minimal incomes. Will the new system be securely based on that household's ability to pay, not on other artificial criteria relating to property and the number of people, irrespective of income?