BESA - the Building Engineering Services Association is the UK's pioneering trade association for building services engineering contractors – representing the interests of firms active in the design, installation, commissioning, maintenance, control, and management of engineering systems and services in buildings.

RAI Amsterdam's first exhibition in 1895, they have grown into a leading international exhibition and conference organization. They’ve been uniting different worlds, people and markets for more than a century, both at home and abroad. Today, they welcome more than 500 national and international conferences, exhibitions and other events, and more than 1.5 million visitors annually.