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

Balfour Beatty Construction Services UK
Boulting Group Ltd
Brand Energy & Infrastructure Services UK Ltd
Doosan Babcock Ltd
GE Boiler & Plant Solutions
GE Power Thermal Solutions
Howden UK Ltd
Jenkins & Davies Engineering
Laker Vent Engineering Ltd
MII Engineering Ltd
Palmers Scaffolding UK Ltd
Rainham Industrial Services Ltd
Siemens
Skelton-Thomas Engineering Ltd
TEi Ltd
Unit Engineers & Constructors
Weir Power & Industrial
Wood plc