How is £8 per annum even a measurable quantity to use in a statement of cost comparison? Where do these numbers come from? One or two bad weeks of winter weather can see your bills fluctuate by a more meaningful sum that £8!!! Also why tar all Air Source Heat Pumps with the same brush - there are air to air and there are air to water systems - clearly in this report air to water is being discussed. Facts and figures - come on H&V News - make them tangible.