Material changes that could affect you all...

[biffvernon]

bad link?

Try:
http://www.communities.gov.uk/publications/planningandbuilding/partlf2010conresponses

b) replacement windows: many expressed strong reservation that the window energy rating was being proposed as the primary basis of demonstrating compliance. There were many calls to retain whole window U-values and to allow centre-pane U-values in well defined circumstances, as well as recognising the benefits of secondary glazing.

 

[Joiner]

Apologies for that link. Should have been...

http://www.communities.gov.uk/publications/planningandbuilding/partlf2010conresponses