The Carbon Emissions Reduction Target (CERT) is the Government's principal instrument for encouraging households to install insulation. However, CERT is not a Government managed scheme, but rather a carbon saving obligation placed by Government on energy supply companies with more than 50,000 customers. Suppliers meet their targets by promoting (typically through subsidised offers) and installing a mix of approved energy efficiency measures, including insulation measures. Energy suppliers each have their own contracts with insulation companies which are treated as commercial in confidence. A small amount of insulation activity is directly funded through the Government's flagship fuel poverty programme—Warm Front. However, no contractors have been removed in the last five years.