| AMEC Controls (Airport Group) | AND Technical Services Ltd | Areva (T & D) Ltd |
| ATG Airports Ltd | Automation Design International Ltd | Automation Systems International Ltd |
| Beamech Ltd | Berry Beauford Ltd | BIE Automation Ltd |
| Biwater International Ltd | Boulting Group Plc | BOVIS TANVEC |
| Briggs Automation (Part of Briggs Plc) | British Gypsum Plc | Cadbury Trebor Bassett |
| Cameron Controls Ltd | Capula Ltd | Clough Williams Power Ltd |
| Cogsys Ltd | Cougar Automation Ltd | Daifuku Europe Ltd |
| DB Controls Ltd | Degremont (UK) Ltd | Denca Controls Ltd |
| Eisenmann Gmbh | Eli Lilly Plc | Engenica Ltd |
| ENTEC (UK) Ltd | Fabricom Controls Ltd | Fairport Engineering ltd |
| Farebrother Plc | Fielding & Platt Ltd | Fisher Rosemount Ltd |
| Foster Wheeler Energy Systems Ltd | Foxboro (Invensys) UK Ltd | G K Electrical Ltd |
| Glaxo Smith Kline Plc | Greater Manchester Passenger Transport Executive | GU Projects Ltd ( three Valleys Water ) |
| Haden Ducost Ltd | Hazmac (Handling) Ltd | Henkel Ecolab Ltd |
| Howorth Airtech Ltd | INBIS Ltd | Interserve Plc |
| Kaltek Automation Ltd | KMI Water Ltd | Knauf (UK) Ltd |
| Laing Engineering Ltd | Lloyd Morris Electrical Ltd | Lodige Gmbh |
| Lostock Electrical Projects Ltd | Mannesmann Demag Ltd, | Merck, Sharp & Dohme |
| Mitchelin Tyres Plc, | Molins Plc, | Motherwell Information Systems Ltd, |
| Mott McDonald Controls & Communications Ltd, | Mowlem Engineering Ltd, | Nestle PLC |
| NIS Ltd, | Nordiko Plc, | Northwest Projects Ltd, |
| Northwest Switchgear Ltd, | Novartis Plc, | Pandelco Ltd |
| Parker Projects Ltd | Pharmacia Upjohn (Sweden) | Pierse Contracting Ltd |
| Piggott & Whitfield (Electrical) Ltd | PM Foods (UK) | Proctor & Gamble Product Supply (UK) Ltd |
| Project Management (Ire) Ltd | PZ Cussons (International) Ltd | Raytheon Engineers & Constructors (UK) Ltd |
| Rockwell Australia | Rockwell Automation Ltd | Rolls Royce NES Ltd |
| Rotork Control & Safety Ltd | RTS Thurnall Plc | Sanofi Winthrop Ltd |
| Serck Control & Safety Ltd | Siemens (Ire) Ltd | Siemens Dematic Ltd |
| Siemens Integrated Solutions Ltd | Siemens Transportation (HK) | Siemens Transportation Gmbh |
| Silvertech Industrial Automation Ltd | Silvertech Ltd | Simon Hartley Ltd |
| Spooner Vickers Ltd | Strachan & Henshaw Ltd | Street Crane Ltd |
| Syseca Ltd | Tarmac (Central) Plc | Tetrapak Ltd |
| TRANSCO Plc | Turbine Controls Ltd | Turkington Engineering Ltd |
| Tyco Control Systems Ltd | United Utilities Plc | USF Waste Water Process Group |
| Varcol Electrical Ltd | Wainwright & Gibson Ltd | WH Good (Systems) Ltd |
| Whippe & Bourne Switchgear Ltd | Wilcock Consultants Ltd | Yokogawa (UK) Ltd |
| Ansaldo Rail Signalling | Fabricom Airport Systems UK Ltd | Biwater Leslie JV |
| Adsyst Control Systems | Nuclear Engineering Services Ltd | Nomenca Plc |
| Severn Trent Service Ltd | Southern Water Plc | Costain Gallifiord try JV |
| Veolia Water Solutions technology Ltd | Biwater Treatment Ltd ( Preferred Supplier ) | Veolia Water Plc |
