From the HES website:
Overview | Professional bodies | Trade bodies | Training organisations | Other relevant organisations
Other relevant organisations
BSI Group (British Standards Institution)
Telephone: 020 8996 9000
Email: cservices@bsigroup.com
Website: www.bsigroup.com
Society for the Protection of Ancient Buildings (SPAB)
Telephone: 020 7377 1644
Email: info@spab.org.uk
Website: www.spab.org.uk
Sustainable Traditional Buildings Alliance (STBA)
Telephone: 020 7704 3501
Email: info@stbauk.org
Website: www.stbauk.org
Wood for Good
Website: www.woodforgood.com