They maintain an up-to-date register of competent and qualified gas installation businesses and ensure that they and their operatives are aware of their requirement to register. They also raise the awareness of gas safety with consumers and encourage them to only employ registered gas installers.

Registration is now a legal requirement for businesses and self-employed people working on gas fittings or appliances. Around 44,000 gas installation businesses employing approximately 95,000 gas fitting operatives are currently registered.

Founded in 1906, the Institute of Plumbing is the UK's professional body for plumbers and others in the plumbing industry.

It has a membership of 11000, some 3500 of whom are listed in their Member Directory where a local Registered Plumber can be found by simply entering a postcode. All members listed have had to prove their plumbing competence through recognised qualifications or extensive experience.

The Institute is a registered educational charity with the prime objective of improving the science, practice and engineering principles of plumbing in the public interest. It's members support this aim and agree to a 5-point Code of Professional Standards

Constructionline is the UK’s largest register of pre-qualified construction services. It streamlines procedures by supplying the construction industry and its clients with a single national pre-qualification scheme.

Constructionline is owned by the Department of Industry (DTI) and is a contributor to the Rethinking Construction initiative. It is the UK’s largest register of pre-qualified construction contractors and consultants. Constructionline is designed to streamline procurement procedures and save valuable resources in the construction industry rendering it more efficient and effective.

Over 10,000 contractors and consultants are registered with Constructionline and have all met pre-qualification requirements supported by the DTI. They cover the full spectrum of construction activities from architecture to demolition and range in size from small specialists to the largest main contractors.

Constructionline's 1300 plus clients range from large central government departments to Local Authorities, Universities / Further Education and NHS Trusts. They have direct access to the database and Constructionline helps them to achieve best value objectives.

The Environment Agency are the leading public body for protecting and improving the environment in England and Wales.

CITB (Construction Industry Training Board) delivers products and programmes through a national network of staff based in regional offices. CITB works in partnership with local colleges, Regional Development Agencies, the LSC, schools and others so that national policies meet local needs.

NTO Strategy and Research provides information and policy advice to other business areas building CITB's NTO status.

Standards and Qualifications accredits occupational standards and develops and maintains the NVQ/SVQ framework.

Certification and Registration manages and promotes competence-based registration schemes for the industry.