- AEA Technology plc (1)
- Mott MacDonald Ltd.
- World-wide consulting engineers engaged in projects from transport, energy, water, and the environment to building, industry, and communications. - Roxboro Group PLC (3)
- Upperton Limited
- Specialises in spray drying and particle technologies. - WT Parker Group
- Provides electrical and mechanical design and installation, as well as process and control systems implementation. - NNC
- Provides multi-disciplinary engineering, project management, and technical consultancy services worldwide. - Cumberland Cathodic Protection
- Established in 1912 and specialising in turnkey contracts, equipment, design and site service, and in house manufacturing. - Charter plc (3)
- BI Group plc
- The parent corporation of an international group of specialist engineering companies which operate in the sport goods, manufacturing, industrial, medical, and service areas. - Hytek Services
- Specialises in engineering design, jig and tooling, CNC programming, project management and recruitment services for aerospace and high technology. - Delta plc (4)
- PublicStar
- Specialists in the design, building, installation, and commissioning of building management systems. - Henry Williams Electrical Ltd
- Instrumentation, control, and automation engineers, offering design and manufacture of systems in the rail, water, aviation, and transport sectors. - Reid Crowther Professional Engineering and Mapping
- Provides environmental, water treatment, and civil engineering, mapping, and project management services to the Nigerian and U.K. markets. - Applied Containment Engineering (ACE)
- Designing and developing advanced high specification barrier containment systems. - Aladon Ltd
- Provide training and consulting services in the application of reliability centred maintenance. - Threaded Group
- Hi-tech engineering. - GIBB Ltd.
- Providing engineering consulting, design and management advice. - Technical Engineering Developments Limited
- Computer aided design/drafting company offering services in mechanical and structural engineering, finite element analysis, and technical illustration. - Dyer Engineering Ltd
- Offers CNC cutting, profiling, machining, fabrication, and specialist engineering services. - Spectrum Alloys, Ltd.
- Non-ferrous stockholder, including stainless steel, aluminium, bronze, brass, and more. - Crossland Engineering
- Services include industrial pipework fabrication and installation, welded fabrications, control systems, and site services. - Digilog Services Ltd
 - Penny + Giles Instrumentation Ltd
- Supplier of paperless chart recorders, pressure transducers, telemetry and indicators. - L. Gardner Group PLC (3)
- Marshall Grit Blasting
- Specialists in grit blastng and protective coatings for ferrous and non-ferrous metals, stonework, woodwork, glass, and other materials. - Fairburn Engineering
- Offers electrical and mechanical engineering including marine engineering, electrical contracting, and motor rewinds. - Interserve Engineering Services
- Provider of mechanical, electrical, and public health services for buildings. - Lewtham Engineering Ltd
- Scuba diving equipment, fishing tackle, English Centre-pin/ trotting reels, priests, glass working machinery/tooling, archery equipment, pyro branding tips. - BBA Group
- CEMMNT
- The Centre of Excellence in Metrology for Micro and Nanotechnology (CEMMNT), delivers unrivalled metrology, surface analysis, analytical, and systems engineering services.
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