| Reliance Security Services Ltd | 020 7833 8241 | | Surety House, 25-28 Field Street, London, WC1X 9DA |  Map & Directions |
| Ministry Protection Services Ltd | 01992 711335 | | 27 Old Gloucester Street, London, WC1N 3AF | | Map & Directions |
| Mabrouk Electronics Co Ltd | 020 7837 1748 | | 51 Calthorpe Street, London, WC1X 0HH | | Map & Directions |
| Enigma Commercial Services Ltd | 020 7404 2266 | | 67 Chancery Lane, London, WC2A 1RH | | Map & Directions |
| Rescom Facilities Management | 020 7247 9922 | | 93 Worship Street, London, EC2A 2BW | | Map & Directions |
| Hansard Security Services Ltd | 020 7283 5069 | | The Baltic Exchange, 38 St. Mary Axe, London, EC3A 8BH | | Map & Directions |
| Britsec International | 020 7729 4992 | | 2a Luke Street, London, EC2A 4NT | | Map & Directions |
| The Corps | 020 7566 0500 | | Market House, 85 Cowcross Street , London, EC1M 6PF | | Map & Directions |
| Tisco Securities Uk Ltd | 020 7236 6688 | | 76 Cannon Street, London, EC4N 6AE | | Map & Directions |
| Capcon Argen Ltd | 020 7448 3900 | | 26 Finsbury Square, London, EC2A 1DS | | Map & Directions |
| Holland House Security | 020 7283 2983 | | Holland House, 1-4 Bury Street, London, EC3A 5HT | | Map & Directions |
| Hill Farm Securities Plc | 020 7743 6550 | | 1 Cornhill, London, EC3V 3ND | | Map & Directions |
| London Wall Partnership | 020 7796 1125 | | 1 London Wall, London, EC2Y 5EA | | Map & Directions |
| Global Network Cctv Ltd | 020 7377 2444 | | 11 Plough Yard, London, EC2A 3LP | | Map & Directions |
| Sharlock Alarms | 020 7837 8278 | | 36a Myddelton St, London, EC1R 1UA | | Map & Directions |
| Beck Security Ltd | 020 7251 6116 | | Newspaper House 3rd Floor, Singer Street, London, EC2A 4BQ | | Map & Directions |
| Beck Security Uk Ltd | 020 7251 4838 | | 1st Floor, 5-6 Mallow St, London, EC1Y 8RS | | Map & Directions |
| Pantherr Security | 020 7837 0111 | | Lector Court, 151-153 Farringdon Road , London, EC1R 3AF | | Map & Directions |
| Sumitomo Trust International Plc | 020 7315 8000 | | 155 Bishopsgate, London, EC2M 3TS | | Map & Directions |
| Chubb Electronic Security Ltd | 0870 241 8580 | | 96-100 Clifton Street, London, EC2A 4TN | | Map & Directions |
| Hatton Garden Safe Deposit Ltd | 020 7405 9600 | | 88-90 Hatton Garden, London, EC1N 8PN | | Map & Directions |
| First Security Ltd | 020 7837 5460 | | 58-59 Myddelton Square, London, EC1R 1TB | | Map & Directions |
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