ISO 14001:2004 is the internationally recognised standard for an organisation's Environmental Management System and as such we are very proud to have been awarded this UKAS accreditation which makes a powerful statement about our commitment to the environment and gives us internationally recognised 'Green Credentials'. For more information ISO 14000 / ISO 14001 Environmental Management Standard

The Microgeneration Certification Scheme (MCS) is an independent scheme that certifies microgeneration products and installers in accordance with consistent standards. It is designed to evaluate microgeneration products and installers against robust criteria providing greater protection for consumers. For more information www.bre.co.uk

Safecontractor is an accreditation scheme that assesses the health safety competency of contractors and service providers. Clients have a legal obligation to ensure that external contractors and service providers working on their premises operate in a safe way. There is therefore a need to assess contractor's health & safety arrangements and increasingly this is being carried out through Safecontractor. Many large organisations now use Safecontractor as their primary means of selecting contractors. For more information www.safecontractor.com

The UK register of pre qualified construction services. At the heart of what we do is our national online database, the UK's largest register for pre-qualified contractors and consultants. In terms of efficiency, time and cost saving and best practice, Constructionline is proven to deliver for public and private sector organisations alike. Our service is recommended by the OGC Common Minimum Standards and The Local Government Task Force. For more information www.constructionline.co.uk

CHAS is established as the market leader for health and safety pre-qualification in the UK. It is a non-commercial scheme available to suppliers (those who provide goods and services) and to organisations (buyers) looking for suitably competent suppliers. For more information www.chas.gov.uk

Achilles works to identify, qualify, evaluate and monitor suppliers on behalf of major organisations worldwide. We build and support buyer-supplier communities in many industry sectors, creating unique and powerful global networks. Our services for sustainable procurement help create opportunities for business and reduce risk in the supply chain. For more information www.achilles.com

HVCA adds value to members' businesses by providing quality services, promoting excellence and shaping the commercial environment through representation and leadership. HVCA members are subject to regular, third-party inspection and assessment to ensure their technical and commercial competence. For more information www.hvca.org.uk

REFCOM has been running a voluntary registration scheme since 1994 to promote the responsible handling of ozone depleting refrigerant gases. In June 2009, REFCOM Certification Ltd was appointed by the Secretary of State for the Environment, Food and Rural Affairs to operate a Certification Body under the stationary equipment provisions of the Fluorinated Greenhouse Gases Regulations 2009 No 261. For more information www.refcom.org.uk

Building Engineering Services Competence Accreditation Ltd (BESCA) is a national assessment and certification body for the building services industry. It is an independently operated company owned by the HVCA. For more information www.besca.org.uk