| Advanced Music Systems Ltd | AMEC Controls (Airport Group) | AMPAC Systems Ltd |
| AND Technical Services Ltd | Areva (T & D) Ltd | AT Group Plc |
| Atlas Hurley Moate 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 Smith Ltd |
| Clough Williams Power Ltd | Cogsys Ltd | Control Systems Ltd |
| Cougar Automation Ltd | Courtaulds Engineering Ltd | Daifuku Europe Ltd |
| DB Controls Ltd | Degremont (UK) Ltd | Denca Controls Ltd |
| Drake & Scull | Eisenmann Gmbh | Eli Lilly Plc |
| Engenica Ltd | ENTEC (UK) Ltd | Fabricom Controls Ltd |
| Fairport Engineering Plc | 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 | Haden Ducost Ltd | Hazmac (Handling) Ltd |
| Henkel Ecolab Ltd | Howorth Airtech Ltd | INBIS Ltd |
| Instem 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 |
| M J Gleeson Plc, | Mannesmann Demag Ltd, | Merck, Sharp & Dohme |
| Midtown Controls Ltd, | 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, |
| OTVB Ltd, | 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 Moore Process Ltd | Siemens Transportation (HK) | Siemens Transportation Gmbh |
| Silvertech Industrial Automation Ltd | Silvertech Ltd | Simon Carves 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 |
| United Utilities Plc | USF Waste Water Process Group | Valmet Ltd |
| 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 |
