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Energy Prices

The Secretary of State rightly talked about the simplification of tariff structures. Will he give a commitment to the House to look carefully at the possibility of enforcing a rising block structure? In an era of rising energy costs, it seems inequitable that the highest per unit cost should be paid for the first tranche, which of course the poorest families have to use. We should be applying the polluter pays principle, which means that as we use more energy, we pay more per unit for it. Please will the right hon. Gentleman look at that?