ECO4 is a UK government scheme requiring large energy suppliers to fund energy-saving measures, like insulation, for low-income and vulnerable households. It aims to reduce energy bills and carbon emissions by improving energy efficiency in homes with poor energy ratings.

The Great British Insulation Scheme provides free or subsidised insulation to eligible households, particularly those in lower council tax bands or receiving benefits. It's designed to cut energy costs and improve home energy efficiency across the UK.