Every year thousands of people die from living in cold homes. Millions more can’t afford to keep their homes warm, and suffer not only from the cold, but from the myriad physical and mental health problems that fuel poverty brings. There is a solution, and it isn’t rocket science. A major, publicly-funded energy efficiency programme to insulate every home in the country would save the average household £300 on their energy bill and bring millions out of fuel poverty. It would also significantly increase energy security, and help us to hit the carbon emissions reduction targets set in the Climate Change Act, Labour’s most important environmental achievement in its last term of office. So, why aren’t we getting on with it? The usual answer is “it’s expensive!”. On the one hand, that’s true – a really effective scheme would need a secure funding stream of about £4bn per year until 2025. But on the other hand, on closer examination, it isn’t. A long-term, large-scale insulation programme would bring major, long-term, financial benefits which would pay back the initial investment. It would do, in spades, everything Infrastructure UK says major investment is meant to, and which the country needs so badly: strengthen the economy, create jobs, and increase living standards.