This site being administered for Defra /DECC by
NNFCC is the centralized knowledge base for the Government drive to encourage AD to help climate change /carbon by utilizing waste . It also contributes to landfill restrictions and rising costs as well as NVZ problems ( probably the main drivers ) then the link to biogas-info
http://www.biogas-info.co.uk/
http://www.nnfcc.co.uk/metadot/index.pl?id=9710;isa=DBRow;op=show;dbview_id=2317