My hon. Friend makes an important point. Energy performance certificates can make a significant difference, particularly if they are linked to new programmes, such as those involving green mortgages and other kinds of grants for home owners. He will know that the measure has been strongly supported by WWF, Friends of the Earth, the Campaign to Protect Rural England and a range of environmental groups; they are strongly saying to us that it would be a travesty if energy performance certificates were to be delayed.