Rolls Royce is a world-leading provider of power systems and services for use at land, at sea and in the air. It has a strong position in the global markets.

BTR is a large UK based engineering company. 

FKI Energy is a British engineering and manufacturing company established in 1920. 

Founded in 1963, Domnick Hunter is a UK based engineering company. It designs and manufactures filers,  dryers, breathing air purifiers, condensate management products and ancillary equipment.