As of Wednesday all publicly accessible government buildings over 1,000m2, including the Houses of Parliament are required to display certificates showing their energy usage, but with trading standards saying nobody will be prosecuted for non-compliance until 2009, it seems to have been something of a soft launch.
The Houses of Parliament achived a G, the lowest rating possible.
Postscript
Dob in your local power hungry library or swimming pool at forum.building.co.uk
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