Useful Links
http://www.communities.gov.uk/planningandbuilding/theenvironment/energyperformance/
The governments site explaining EPC legislation.

http://www.residentiallandlord.co.uk/news1323.html
Residential Landlords web site

http://www.nher.co.uk/pages/accreditation/accreditation_home.php
NHER Accreditation scheme.

http://www.quidos.co.uk/accreditation_overview.html
Quidos Accreditation scheme.

http://www.planningportal.gov.uk/england/professionals/en/1115314110382.html
Building Regulations Approved Documents.