- Aircraft Research Association Ltd
 - Independent nonprofit research and development organisation and was set up in 1952 as a wind tunnel test centre for the U.K. aircraftindustry. - BAE Systems
- Contractor and systems integrator in the air, land, sea, space, and command and control market sectors.
- Centrax Ltd.
- Designing and manufacturing gas turbine driven generator sets, specialising in cogeneration/CHP applications, and machined components and assemblies.
- Cobham (1)
- CSDE Ltd
- Doncasters Bramah
- Specialising in metal forming, fabrications, and assemblies in titanium and nickel alloy applications for the aerospace industry.
- GKN
- Global company with activities in the automotive, aerospace, and industrial services sectors.
- Lockheed Martin UK
- Combines Lockheed Martin¿s United Kingdom defence, civil, and commercial business interests.
- Microturbo Limited
- Repairer of small/medium gas turbines and a manufacturer of parts and accessories for various O.E.M.'s.
- Wesco Aircraft UK
- Stockists/distributors of American aerospace hardware.
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