Information sites:

www.cda.org.uk  (Copper Development Association)
www.copperconcept.org  (Copper in Architecture)
www.eurocopper.org/copper/index.html
www.aecb.net (Sustainable Building Association)
www.sustainablehomes.co.uk
www.sustainable-development.gov.uk
www.energysavingtrust.org.uk
www.environment-agency.gov.uk
www.envirowise.gov.uk
www.buildingconservation.com
www.listedpropertyownersclub.co.uk
www.little-earth.co.uk
www.greenspec.co.uk
www.archbone.co.uk (Construction Product Directory)

Other products:

www.iancoxroofing.co.uk  (metal roof specialist)
www.hellenicgarden.co.uk (Oak water butts & rainwater barrels)
www.rainharvesting.co.uk  (water harvesting underground tanks)