| The National Examination Board in Occupational Safety and Health | www.nebosh.org |
| Institution of Occupational Safety and Health | www.iosh.co.uk |
| Institute of Environmental Management and Assessment (IEMA) | www.isepglobal.org |
| ProQual | www.proqualab.com |
| British Standards Institute (BSI) | www.bsigroup.com/en-GB |