This is the NetRegs page for compliance by topic and covers the broader environment for all sectors.
A good place to start if you're new to this; will act as a check for those already compliant but possibly haven't reviewed or sought updates recently.
A guide to reducing the environmental impact of your conferences and seminars; works for event venues as well.
More formal approach to advice about making 'Green Claims' that will help organisations develop clear and honest 'Green' marketing. Full pdf guide and webpage with useful links.