Martin Lewis’ MoneySavingExpert.com website has issued an urgent warning to anyone who had solid wall insulation installed since April 2022. It relates to people who used the Energy Company Obligation 4 (ECO4) or Great British Insulation Scheme (GBIS). These were set up by the Government as ways for households to apply for energy -efficiency upgrades to their home. However, routine checks by independent body TrustMark have now identified “widespread cases of poor-quality solid wall insulation