The official gas registration body for the UK, Isle of Man and Guernsey, appointed by the relevant Health & Safety Authority for each area. By law all gas engineers must be on the Gas Safe Register.




The UK’s leading trade organisation representing the interests of firms in all aspects of engineering systems and services in buildings.


The BESCA Competent Person Scheme is ideal for installers working in Electrical – Plumbing – Oil – Solid Fuel – Heating and Hot Water – Ventilation and Air Conditioning.


Severn Trent Water run the WaterMark scheme for responsible and reputable plumbers. They will only give this accreditation to the kind of qualified professional that they can wholeheartedly recommend to their customers.



The Environment Agency are the leading public body for protecting and improving the environment in England and Wales.  William Bailey Ltd is accredited by the Environment Agency.



The Contractors Health and Safety Assessment Scheme is a pre-approval scheme, which allows contractors to demonstrate to potential clients that they meet the required Health and Safety standards



Society of Engineers Institute of Plant Engineers was founded in 1946 and is the Professional Sector for people whose engineering skills are typically used in industrial, manufacturing, military and utility processes for ensuring machinery and equipment can be operated safely, efficiently and in an environmentally sustainable way.


Constructionline is a register for pre-qualified contractors and consultants used by the construction industry of the UK. The database contains details for over 46,000 suppliers and is accessed by more than 4,000 buyer organisations.  William Bailey are now Constructionline Gold Members.


CIBSE (The Chartered Institute of Building Services Engineers) is an international body which represents and provides services to the building service profession. The Institutes’ main function is to confer an internationally recognised badge of quality.



The Scheme is a SSIP-approved health & safety assessment scheme for contractors who want to demonstrate responsibility for their legal health and safety requirements. The holder receives an accreditation certificate and van sticker to prove they have the Safe Contractor seal of approval.


Refcom F-Gas is the UK’s market leading F-Gas certification scheme, operating since 1994. The Refcom Register of Companies competent to manage Refrigerants.