My hon. Friend makes an important point about enforcement. There were weaknesses in the enforcement of the 2002 building regulation improvements. Since then, we have enhanced the enforcement of the latest improvements in the building regulation standards of 2006 by putting in place a broad programme of training and other steps such as compulsory pressure testing. We need to go further, however, and we will over the next 10 years progressively set higher building regulation standards for energy efficiency in order to cut carbon emissions from homes; we are clear that improved enforcement must be a part of that programme.