Mr. Gavin Kelly:

It is all to do with a commitment to the environment and to incentivise buying low-energy rated houses. Ideally, as the Deputy will know in relation to Government plans on carbon footprint and carbon output, ultimately the Government's ambition will be to move to carbon footprint per house. Maybe we could look at that in due course. At the moment we felt that the best way to incentivise low-carbon footprint is through energy ratings of houses. That is how we do it.