The government’s decision in 2013 to reduce support for home insulation upgrades will add up to £18 billion to the cost of the two-year Energy Price Guarantee, according to new analysis from the Energy and Climate Intelligence Unit. The think tank said if the support had remained in place, then 10 million homes – or 40% of the UK’s housing stock – could have been fitted with loft and cavity wall insulation, lowering total domestic gas demand by around 10%.