More than 30,000 UK homes have received poor-quality insulation under the ECO4 and Great British Insulation Scheme (GBIS), Minister Miatta Fahnbulleh admitted - calling it a "systemic failure." Many of the affected properties are in lower-income regions, notably Luton and County Durham, where reports of mould, damp and crumbling walls have emerged. The revelation has fuelled fears that flaws in Britain's retrofit schemes are not isolated mistakes but part of a recurring pattern.