Cavity wallinsulation slows down the rate at which warm air escapes your property, keeping each room of your house warm even when it is bitterly cold outside.
If you are living on means tested benefits AND you live in the hardest-to-heat homes you may be eligible for a free new central heating boiler, insulation for a hot water cylinder, loft, cavity wall and solid wallinsulation, draught proofing for doors and windows or renewable energy technologies such as solar panels.