- Conformance Ltd
- ITC Services
- Eaton
- Applus+ 3C Test
- Intertek
- Total Information Assurance
- SGS
- UKAS
- Oxford Instruments
- BAE Systems
- Technology International
- Element Materials Technology
- ETS
- TÜV SÜD – EMC Testing
- AQL EMC
- MDL Technologies
- Eurofins York
- TestEquity, formerly mcstest
- Raymarine
- Electric Triangle Company Ltd
- Thales
- Schaffner
- dB Technology
- Wurth Electronics UK
- EMC Partner UK Ltd
- CASS Industries Ltd
- SAAB
- Unit 3 Compliance
- Rohde & Schwarz
- National Physical Laboratory
- R.N. Electronics a part of kiwa
- Sky UK Limited
- Product Approvals Ltd
- WEMEC
- Montena Technology
- Trescal
- CCQS UK Ltd
- Cranage EMC & Safety
- Rolls Royce
- RIcardo Rail
- MS Testing
- Malvern Optical
- Peak Electromagnetics LTD
- Leonardo
- HMGCC
- Cherry Clough
- Eurofins Hursley
- Qinetiq
- AWE
- UL
- Cre8 Associates
- A HORIBA Company – MIRA
- Poly, now a part of HP
- Arrival
- Kiwa Electrical Compliance
- AR United Kingdom
- ZF Automotive UK Limited
- Wave Scientific
- METECC
- MVG – Microwave Vision Group
- ACB Europe Ltd
- Eurofins ETC
- Safran Electrical & Power
- Dyson
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