A whole alphabet of regulations may be changed soon, as the government aims to tighten up energy efficiency, while not overburdening businesses. It’s already rewritten the definition of zero carbon. Here’s what’s in force and what’s coming up

Already in force

Parl L of the ÐÇ¿Õ´«Ã½ Regulations

The latest version of Part L took effect in October 2010 an