Building Engineering Services Association

The Building Engineering Services Association (BESA), until 2012 the Heating and Ventilating Contractors' Association, and from then until 2016, B&ES, is the main UK trade association for companies that design, install, commission and maintain heating, ventilation, air conditioning, refrigeration (HVACR) and related engineering projects. == History == The association has undergone several name changes since it was initially founded in 1904.

Source: Wikipedia — Building Engineering Services Association (CC BY-SA 4.0)