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| A & C Steel Erecting Limited | |
| A & J Dixon (Engineering) Ltd | |
| A & L Limited | |
| A G S (Steel Erectors) Ltd | |
| A J Structural Steels Limited | |
| A L Crane Hire & Erection | |
| A. S. K. Rewinds Limited | |
| A1 Engineering Limited | |
| Able Engineering | |
| Absorption Technology Ltd | |
| ACM International Ltd | |
| Addison Project plc | |
| AE&E Lentjes UK Limited | |
| AHL Industrial Pipework Specialists Ltd | |
| Air Products plc | |
| Aker Offshore Partner Ltd | |
| Aker Process Limited | |
| Aker Solutions E&C Ltd | |
| Alfa Laval Limited | |
| Allison Construction Services | |
| Alpha Plus Limited | |
| Alstom Power Limited | |
| Amalgamated Construction Ltd | |
| AMEC Natural Resources Division | |
| AMEC NNC Limited | |
| AMEC Power and Process UK & Europe | |
| AMT Systems Limited | |
| Analytical Technical Services | |
| Andritz Limited | |
| Anglian Erection Services Ltd | |
| ARC Fabrications (King's Lynn) Ltd | |
| Archbell Greenwood Structures Ltd | |
| Argos Inspection Company Ltd | |
| Ashbrook Simon-Hartley Ltd | |
| AT Group Limited | |
| Atkins Nuclear Decommissioning & Generation | |
| Atkins Oil & Gas | |
| AV Technology Ltd | |
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| Banfield Engineering Company (Wisbech) Ltd | |
| Bechtel Limited | |
| Beck & Pollitzer Engineering Ltd | |
| Becro Engineering Services Ltd | |
| Bett Erection Limited | |
| BIS O'Hare Limited | |
| Black & Veatch Limited | |
| Blackrow Engineering Company Ltd | |
| BNS Nuclear Services | |
| BoilerTec Services Ltd | |
| BOMEL Limited | |
| Boulting Group plc | |
| Braham & Dixon (1985) Ltd | |
| Brightwater F.L.I. Limited | |
| Bromsgrove Steel Erection Services Ltd | |
| BTH Boiler Services Ltd | |
| Burnbeam Limited | |
| Bymax Engineering Ltd | |
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| C & A Pumps Limited | |
| C & P Engineering Services Ltd | |
| C Sharp Construction Ltd | |
| C T Steel Site Services Ltd | |
| CADRECRUIT Limited | |
| Cameron Limited | |
| Capital Structures Ltd | |
| Capital Welding | |
| Carillion Nuclear Services Ltd | |
| Castle Engineering Resources Ltd | |
| Cavendish (Northern) Ltd | |
| CB&I UK Limited | |
| CEL International Limited | |
| CET Medway Limited | |
| Chandler Fabrications | |
| Cherrymill Limited | |
| Christ-Kennicott Water Technology Ltd | |
| Cleveland Bridge UK Ltd | |
| CLS Offshore Limited | |
| Clyde Bergemann Materials Handling Ltd | |
| Clyde Materials Handling Ltd | |
| Clydeforth Engineers & Contractors Ltd | |
| Coded Engineering (Site Services) Ltd | |
| Combined Electrical & Engineering Services Ltd | |
| Conroy Electrical Ltd | |
| Cordell Engineering Services Scotland Ltd | |
| Cordell Group Limited | |
| Costain Oil, Gas & Process Ltd | |
| Croston Engineering Ltd | |
| Curtis Munrowd | |
| Curzon Clarke Engineering Ltd | |
| Cyclotech Limited | |
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| D A Hayward & Son Limited | |
| D G Jones Steel Erectors | |
| D K Steel Erection Ltd | |
| D P Services (Scotland) Ltd | |
| Dan Herrick Construction Ltd | |
| Darton Engineering Limited | |
| Davey Site Services Ltd | |
| Davian Site Engineering Services Ltd | |
| David Bilton Engineering Ltd | |
| Davy Process Technology Ltd | |
| Dee Tech Services Ltd | |
| Degremont Ltd | |
| Delta Engineering Group Ltd | |
| Diamond Power Specialty Ltd | |
| DMG Control Systems Ltd | |
| Don Scaife Steel Erecting | |
| Don Valley Engineering Company Ltd | |
| Doosan Babcock Energy Ltd | |
| Doosan Babcock Energy Ltd | |
| DPS (Bristol) Limited | |
| DPS Pipework Services Ltd | |
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| Eagle Construction Engineering (Glasgow) Ltd | |
| Eagle Structural Limited | |
| East Midlands Instrument Company Ltd | |
| Edwards Elite Engineering Ltd | |
| EI WHS Limited | |
| EIMCO Water Technologies | |
| Elsome Engineering Limited | |
| EM&I (UK) Limited | |
| Energy & Environmental Services Ltd | |
| Enpure Limited | |
| Enterprise Engineering Services Ltd | |
| Equipdata Ltd, t/a Industrial Pipework Services | |
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| F J Booth & Partners Limited | |
| F L Smidth Limited | |
| Fabcon Projects Ltd | |
| Fabrication & Installation Ltd | |
| Fabrication Specialists Ltd | |
| Fabricom Suez Ltd | |
| Fairport Site Operations Ltd | |
| Fichtner Consulting Engineers Ltd | |
| Fluor Limited | |
| FMC Kongsberg Services Ltd | |
| Forwardchain Ltd | |
| Foster Wheeler Energy Ltd | |
| Franklyn Yates Engineering Ltd | |
| Frazer-Nash NDT Ltd | |
| Furness Engineering & Technology | |
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| G & G Engineering Mechanical Services Ltd | |
| G R Carr (Essex) Ltd | |
| Gage Engineering Ltd | |
| GDW Engineering & Plant Services Ltd | |
| GE International Incorporated | |
| Gee & Company | |
| Genesis Oil & Gas Consultants Ltd | |
| Gordon Kitto Welding Ltd | |
| Graham Steel Erectors Ltd | |
| Granherne Limited | |
| Granite Services Inc (UK) | |
| Grant & Livingston Ltd | |
| Gravatom Engineering Systems Ltd | |
| Grayton Engineering Ltd | |
| Grimsby Pipework Services Ltd | |
| GRM Engineering & Contract Services Ltd | |
| GS-Hydro (Piping) UK Ltd | |
| GSN Pipework Fabrications & Engineering Ltd | |
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| Haden Freeman Ltd | |
| Haven Engineering Ltd | |
| Haycock & Hague Pipework Systems Ltd | |
| HCS Control Systems Ltd | |
| Henderson Process Systems (HPS) Ltd | |
| Hertel Total Asset Management Ltd | |
| Hi-Line Services (Lichfield) Ltd | |
| HLF (Site Services) Limited | |
| Hold Engineering Ltd | |
| Holme Steel Fabricators Ltd | |
| Honeyman Group Ltd | |
| Hornbill Engineering Ltd | |
| Howden UK Limited | |
| Hutchinson Engineering Ltd | |
| Hydratight Operations Limited | |
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| ICEL (Maidstone) Ltd | |
| Idec Limited | |
| Industrial & Marine Hydraulics Ltd | |
| Industrial Technology Systems Ltd | |
| Interface Contracts Ltd | |
| Interserve Industrial Services Ltd | |
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| J & S Erection Limited | |
| J L Engineering (Rixton) Ltd | |
| J R Macro Limited | |
| J W & E Morris & Son Ltd | |
| Jackson Steel Structures Ltd | |
| Jacobs Engineering UK Limited | |
| Jacobs Industrial Services Ltd | |
| James Fisher Nuclear Ltd | |
| JBD/Tritec Limited | |
| Jenkins & Davies Mechanical Engineering | |
| Jennings Fabrication Ltd | |
| Jex Engineering Company Ltd | |
| JGC Engineering & Technical Services Ltd | |
| JMN Construction Ltd | |
| Johnston Rigging (Fife) Limited | |
| Jordan Engineering Services Ltd | |
| Jordan Nuclear Ltd | |
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| K Home International Ltd | |
| K-Len Construction Services Ltd | |
| K4 Steel Erecting Services Ltd | |
| Karden Pipework Ltd | |
| KBR | |
| KCM Services Limited | |
| KCS Herr Voss UK Limited | |
| Kent Kraft Engineering Ltd | |
| Ketsebridge Limited | |
| King's Site Services (SW) Ltd | |
| Kington Process Ltd | |
| Kirstall Limited | |
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| L & M Precision Engineering Ltd | |
| L E S Engineering Limited | |
| L T Steel Erectors Ltd | |
| Laker Vent Engineering Ltd | |
| Lawton Electrical Ltd | |
| Ledwood Mechanical Engineering Ltd | |
| Leven Bridge Engineering Ltd | |
| Liquid Gas Equipment Ltd | |
| LME (UK) Limited | |
| Lodge Cottrell Ltd | |
| Lorien Engineering Solutions Ltd | |
| Lynx Engineering (Kent) Ltd | |
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| M & N Electrical and Mechanical Services Ltd | |
| M & W Contractors (Pensnett) Ltd | |
| M E Waring | |
| M W Kellogg Limited | |
| Machine Monitoring Systems Ltd | |
| Main Port Engineering (1990) Ltd | |
| MAN Limited | |
| Manrochem Ltd | |
| Matrix Power Limited | |
| MB Engineering Services Ltd | |
| MB Inspection, t/a Applus RTD UK | |
| MC Steel Structures | |
| MCS Structures Limited | |
| MDH Steel Erection Limited | |
| Mechanical Installations International Ltd | |
| Mechatherm International Ltd | |
| Meldan Fabrications Ltd | |
| Mellard Steel Erectors Ltd | |
| METCO Services Limited | |
| Microbac Limited | |
| Mitie Technology & Infrastructure Limited | |
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| NATCO UK Limited | |
| NG Bailey & Company Ltd | |
| Nicolson Engineering Services Ltd | |
| Nordot Engineering Services Ltd | |
| Normand & Thomson (Hillend) Ltd | |
| Northallerton Steel Erection Ltd | |
| Northern Combustion Systems Ltd | |
| Norwest Holst Limited | |
| NRL Limited | |
| Nuclear Decommissioning Services Ltd | |
| Nuffield Radiographic Inspection Ltd | |
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| Oceaneering International Services Ltd | |
| Offshore Design Engineering Ltd | |
| On Line Design & Engineering Ltd | |
| Ovalway Hydraulics Engineering Ltd | |
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| P & H Steel Erection Ltd | |
| P & I Design Ltd | |
| Paper Plant Services (Engineering) Ltd | |
| Parkegate Engineering Consultants Ltd | |
| Parsons Brinckerhoff Limited | |
| Paul Cox Steel Erections Ltd | |
| PDF Erection Services Ltd | |
| Penarth Industrial Services Ltd | |
| Perfect Pipework Ltd | |
| Performance Improvements (PI) Ltd | |
| Peter J Douglas Engineering Ltd | |
| Petreco International | |
| Petrofac Facilities Management Ltd | |
| PI Energy & Emissions Limited | |
| PI Gas Turbines Limited | |
| Pipe & Process Projects Ltd | |
| Pipetawse Limited | |
| Pipework & Mechanical Contracts Ltd | |
| Pipex Limited | |
| Pirson Montage UK Ltd | |
| Plasticon UK Limited | |
| Pleatward Engineering Ltd | |
| PMM Process Solutions Ltd | |
| Power Units (1953) Ltd | |
| PPS Electrical Ltd | |
| Premier Engineering Corporation Ltd | |
| Production Services Network | |
| Project Design & Management Services Ltd | |
| Proweld Engineering Ltd | |
| Pruce Newman Pipework Ltd | |
| PSL Worldwide plc | |
| PTF Engineering Limited | |
| Puma Engineering & Construction | |
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| Quality Verification Services Ltd | |
| Quartzelec Limited | |
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| R & J Pipework | |
| R B Plant Construction Ltd | |
| R Blackett Charlton Limited | |
| R J Wilson Steel Erection Ltd | |
| R M Berwick Steel Erection Services Ltd | |
| Rayfern Ltd, T/A PEME | |
| RBG Limited | |
| Rhomax-ITS Limited | |
| Rhyal Engineering Ltd | |
| Rotamat Ltd, t/a Huber Technology | |
| Rotary Equipment Services Ltd | |
| Rowecord Engineering Ltd | |
| Royden Engineering Limited | |
| RSJ Erectors Limited | |
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| Saipem UK Limited | |
| Scorpion Site Services Ltd | |
| SEC Electrical & Instrumentation | |
| Sellafield Limited | |
| Servomac Limited | |
| SES Electrical Services Ltd | |
| Severn Unival Limited | |
| Shanahan Engineering Ltd | |
| Shaw Group UK Ltd | |
| Shepley Engineers Ltd | |
| Siemens Fossil Power Generation | |
| Siemens Power Generation | |
| Siemens Transmission & Distribution Ltd | |
| Siemens VAI Metals Technologies Ltd | |
| Simkiss Control Systems Ltd | |
| Simon Carves Ltd | |
| Site Service Engineering Limited | |
| Sitemech Utilities Ltd | |
| Snamprogetti Limited | |
| SNC-Lavalin UK Limited | |
| South East NDT Ltd | |
| Specialised Management Services Ltd | |
| Specialist Maintenance Services Ltd | |
| Sprunt Engineering Services Ltd | |
| Stall-Mech Engineering Services Ltd | |
| Starrs Contract Services Ltd | |
| STATS Group | |
| Steel Erecting Services Ltd | |
| Steelcraft Erection Services Ltd | |
| Stone & Webster Ltd | |
| Stork Protech (UK) Ltd | |
| Straight Line Services Ltd | |
| Structural & Weld Testing Services Ltd | |
| Studsvik UK Limited | |
| Sulzer Chemtech (UK) Ltd | |
| Systems Group UK Ltd | |
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| T & A Construction Ltd | |
| Tarvail Limited | |
| Taskmaster Resources Ltd | |
| Taylor & Sons Ltd | |
| Teesside Automation Services Ltd | |
| TEI Limited | |
| The AA Group Ltd | |
| The Clarke Chapman Group Ltd | |
| Thermal Energy Construction Ltd | |
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| UK Steel Erecting Services Ltd | |
| Ultramag Inspection Services Ltd | |
| Unit Engineers & Constructors Ltd | |
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| Veolia Water Solutions & Technologies | |
| Veolia Water Systems Ltd | |
| Vetco Gray UK Limited | |
| Vexamus Water Ltd, t/a Hydro International | |
| Vickers Inspection Services Ltd | |
| Vogal Group Limited | |
| VT Nuclear Services Ltd | |
| VWS (UK) Limited | |
| VWS Westgarth Limited | |
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| W J Fleming Steel Services Ltd | |
| W M Codd Limited | |
| Walker Engineering (NW) Ltd | |
| Washington E & C Ltd | |
| Waterfront Engineering Services Ltd | |
| Weeks Construction | |
| Weir Pumps Limited | |
| Weir Strachan & Henshaw | |
| Weldrite Erecting Services Limited | |
| Westwell Developments Ltd | |
| Whessoe Oil & Gas Limited | |
| Whitcol Engineering (Chesterfield) Ltd | |
| Whitland Engineering Ltd | |
| Wisbech Electrical Limited | |
| Wood Group Engineering (North Sea) Ltd | |
| Wood Group Heavy Industrial Turbine Field Services | |
| Woodhill Frontier Ltd | |
| WorleyParsons Europe Ltd | |
| Wright Brothers Industrial Services Ltd | |
| Wyndham UK Limited | |
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