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Planning and Energy Bill

I do not think that there will be many arguments in the House today except on points of detail. My hon. Friend referred to forward-thinking local authorities. I appreciate that we cannot introduce retrospective legislation, or retrofit legislation, and a builder such as Murphys in my constituency will say that it is perfectly happy and comfortable with the requirements for extensions and new build, but is there not a danger that we could end up with a two-tier system where older converted properties are energy-inefficient and the modern ones are efficient? I appreciate that the Government are doing work in this area, but has he given consideration to that in his new clause?