My Lords, I had not really intended to intervene in this debate because better, more knowledgeable people than me have spoken. However, I add my voice in support. I have built houses in Scotland and England in the past 10 to 12 years and therefore put in a very low-carbon spec. No consumer of any intelligence would build a house without a low-carbon spec because the annual savings in heating that you get give you a nearly 50% return on your money, but unless builders and developers are obliged to give the consumer what they really want, it is unlikely to happen in all cases.
It is interesting that this debate should follow the one on self-build because I cannot believe that anyone who is building their own house would ever dream of not putting in a very good low-carbon spec. The Government should ensure that consumers—also known as voters—get what they want.