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.