The following companies currently have Registered NAECI Category 3 and/or Other Work (which is not Categorised) at various UK locations.

Category 3 and Other Work

Alstom Boiler & Plant Solutions
Alstom Power Thermal Services
Balfour Beatty Construction Services UK
Boulting Group Ltd
Brand Energy & Infrastructure Services UK Ltd
Doosan Babcock Ltd
Howden UK Ltd
Jenkins & Davies Engineering
Laker Vent Engineering Ltd
MII Engineering Ltd
Palmers Scaffolding UK Ltd
Skelton-Thomas Engineering Ltd
Studsvik Ltd
Unit Engineers & Constructors