| Security & Engineering | 020 8868 4410 | | Po Box 264, Pinner, HA5 3WE |  Map & Directions |
| Capital Security Services UK Ltd | 020 8907 5740 | | 194 Kingshill Drive, Harrow, HA3 8QS | | Map & Directions |
| M C Electrical & Security Systems | 020 8423 6099 | | 607 Field End Road, Ruislip, HA4 0RF | | Map & Directions |
| Unitrust Protection Services Ltd | 020 8903 8303 | | Unitrust House, Heather Park Drive, Wembley, HA0 1SS | | Map & Directions |
| Safe 4 U Ltd | 020 8951 0266 | | Premier House, 112 Station Road, Edgware, HA8 7BJ | | Map & Directions |
| Safe Deposit Lockers Plc | 020 8903 5255 | | 335-337 Harrow Road, Wembley, HA9 6BB | | Map & Directions |
| Alarm Professionals | 020 8904 8682 | | 45 Sudbury Court Road, Harrow, HA1 3SD | | Map & Directions |
| Phase Alarms Ltd | 020 8863 8792 | | 189 Headstone Lane, Harrow, HA2 6ND | | Map & Directions |
| A C Van Noey & Associates | 020 8863 5112 | | 180 Canterbury Road, Harrow, HA1 4PB | | Map & Directions |
| Fineplan Video Services | 020 8863 0666 | | 1 Locket Road, Harrow, HA3 7LY | | Map & Directions |
| A S Home Security | 020 8952 6940 | | 38 Manor Park Crescent, Edgware, HA8 7LZ | | Map & Directions |
| Pace Security Services Ltd | 01895 625050 | | 28b Victoria Road, Ruislip, HA4 0AB | | Map & Directions |
| Warlite Security Ltd | 020 8908 6890 | | East Lane Business Park, Wembley, HA9 7SU | | Map & Directions |
| Technica Systems Ltd | 020 8900 2648 | | Technica House, 3-7 Clifford Road, Wembley, HA0 1BZ | | Map & Directions |
| Trooper Systems Ltd | 020 8426 0941 | | 174 Pinner Road, Harrow, HA1 4JP | | Map & Directions |
| Golden Security Systems | 020 8958 5487 | | 56 Glengall Road, Edgware, HA8 8SX | | Map & Directions |
| Omega Security Technics | 020 8427 7757 | | 26 High Street, Wealdstone, Harrow, HA3 7AB | | Map & Directions |
| Safe Defence Ltd | 020 8951 4555 | | Premier House, 112 Station Road, Edgware, HA8 7BJ | | Map & Directions |
| Videoquest 2004 Ltd | 020 8842 2783 | | 27 Masson Avenue, Ruislip, HA4 6QT | | Map & Directions |
| A P Guards Ltd | 020 8795 2659 | | Elvin House, Stadium Way, Wembley, HA9 0DW | | Map & Directions |
| Security First Ltd | 0800 019 0999 | | Grosvenor House, 1 High Street , Edgware, HA8 7TA | | Map & Directions |
| Grand Protection Service | 07830 107469 | | Po Box 524, Edgware, HA8 7WL | | Map & Directions |
| Ability Security Systems Ltd | 020 8952 4477 | | Grosvenor House, 1 High Street, Edgware, HA8 7TA | | Map & Directions |
| Securitas (UK) Ltd | 020 8991 2794 | | Unit 1, Athlon Road, Athlon Industrial Estate, Wembley, HA0 1YJ | | Map & Directions |
| Hoffman Security Plc | 020 8959 8211 | | Security House, 156-158 Deans Lane, Edgware, HA8 9NT | | Map & Directions |
| Bond Security | 020 8902 7301 | | 186 Bridgewater Road, Wembley, HA0 1AR | | Map & Directions |
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