We all need to do our bit to improve energy efficiency and to protect the environment for future generations.  If you discover non-compliance you can report the matter to the relevant authority.
The Property Energy Professional Association (PEPA) has introduced a service for anyone to report instances of non-compliance relating to the energy performance of buildings regulations. Specifically, you can report:
Failure to obtain a valid Energy Performance Certificate (EPC) in respect of marketing a property for sale or let;
Failure to obtain a valid Energy Performance Certificate (EPC) in respect of selling or renting a property;
Failure of a public building to display a valid Display Energy Certificate (DEC);
Failure to obtain an Air-Conditioning Energy Inspection (ACEI) for a building requiring one.
Using the service couldn't be simpler.  To access the on-line reporting form, click here.