We pressed the Department on a key outstanding design flaw: retrofit assessors (who provide information about a home’s energy performance) and retrofit coordinators (who manage the project and should check the retrofit is completed to the correct standards) can be appointed and contracted by the installer they are assessing.93 The National Audit Office reported that retrofit coordinators may therefore be incentivised to approve non-compliant installations to maintain business with installers.94 We also received evidence from a range of organisations highlighting this as a key weakness that must be addressed.95 The Department agreed that there is not enough independence between these roles under the relevant standard (PAS 2035).96