Without loft insulation, as much as 25% of your heating costs goes through the roof every year. With 27cm of insulation you can keep that heat in your house.

Already got insulation? Well, you're getting warmer - but more than six million homes in this country have 7.5cm of insulation or less in their lofts. Topping it up could still save more than 260kg of CO2 per year and leave you with more in your pocket.