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| Company name | Primary business area | Primary coverage | |
|---|---|---|---|
| TKH Security Solutions | CCTV | Global | ![]() |
| Arena International | Integrated security | United Kingdom (UK) | |
| ASSA ABLOY EMEA | Access control | Western Europe | |
| Magnet Schultz Ltd. | Access control | United Kingdom (UK) | |
| The Hemming Group Ltd. | Physical security | United Kingdom (UK) | |
| 1A Hamilton Security Limited | Manned guarding | United Kingdom (UK) | |
| 24/7 Close Protection Ltd | Physical security | United Kingdom (UK) | |
| 247 CCTV Security Ltd. | CCTV | United Kingdom (UK) | |
| 4Site Online Ltd. | Integrated security | Western Europe | |
| 802 Global | CCTV | United Kingdom (UK) | |
| A & K Security Ltd | Access control | United Kingdom (UK) | |
| AC Leigh | Access control | United Kingdom (UK) | |
| ACAM Technology Ltd. | CCTV | United Kingdom (UK) | |
| Accenture | Biometrics | United Kingdom (UK) | |
| Access Cards and Readers | Cards and readers | United Kingdom (UK) | |
| Access Direct | Access control | United Kingdom (UK) | |
| Access Fire And Security North West | Intruder alarm | United Kingdom (UK) | |
| Access Key and Lock | Access control | United Kingdom (UK) | |
| Access-to-Time Ltd (A2T) | CCTV | United Kingdom (UK) | |
| ACCTIV8 | Intruder alarm | United Kingdom (UK) | |
| Aceda Limited | CCTV | United Kingdom (UK) | |
| ADP Security Systems | CCTV | Western Europe | |
| Advance Peripheral Systems Ltd | Intruder alarm | United Kingdom (UK) | |
| Advance Security UK Ltd | Manned guarding | United Kingdom (UK) | |
| Advanced Vision Surveillance Ltd | CCTV | United Kingdom (UK) | |
| AEL Systems LTD | Intruder alarm | United Kingdom (UK) | |
| AES Distribution (NI) Ltd | Intercom systems | United Kingdom (UK) | |
| AJT (UK) Ltd. | Physical security | United Kingdom (UK) | |
| Alliance Security Installations | Physical security | United Kingdom (UK) | |
| Alpha Integrated Systems Ltd | CCTV | United Kingdom (UK) | |


