| B & G Security Ltd | 020 7249 9243 | | Metropolitan Workshops, Enfield Road, London, N1 5AZ |  Map & Directions |
| Eskan Electronics | 020 7278 1768 | | 168 Caledonian Road, London, N1 0SQ | | Map & Directions |
| Cas Security Ltd | 020 8288 0206 | | 10 Caledonia Street, London, N1 9DZ | | Map & Directions |
| Canal Video Audio Visual Ltd | 020 7837 8741 | | 168 Caledonian Road, London, N1 0SQ | | Map & Directions |
| United Guardian Services Ltd | 020 8348 0595 | | 130 Hewitt Road, London, N8 0BN | | Map & Directions |
| Lee Security Ltd | 0870 241 4272 | | Steveni Kessler House, Goodwin Road, Dominion Business Park, London, N9 0BG | | Map & Directions |
| Cctv Co | 020 8343 7879 | | Rowlandson House, 289-293 Ballards Lane, London, N12 8NP | | Map & Directions |
| Able Shutters | 020 8885 5332 | | Able House Chalgrove Road, Tottenham, London, N17 0JJ | | Map & Directions |
| Safelink Services Ltd | 020 8361 2444 | | 135 High Road, London, N11 1PP | | Map & Directions |
| Woodside Security Systems Ltd | 020 8444 2277 | | 425 Long Lane, London, N2 8JN | | Map & Directions |
| Gsm Security Ltd | 020 8374 7744 | | 31 Tottenham Lane, London, N8 9BD | | Map & Directions |
| J M F Vision Systems Ltd | 020 8445 0452 | | Friern Park, The Lindens, London, N12 9DJ | | Map & Directions |
| Blakeglow Ltd | 020 8884 2495 | | Unit A4 Hastingwood Trading Estate, Harbet Road, London, N18 3HT | | Map & Directions |
| Woodside Security Systems Ltd | 020 8446 2661 | | 29a Westbury Road, London, N12 7NY | | Map & Directions |
| London Security And Investigation Services Ltd | 020 7288 2200 | | 205 Aberdeen House, London, N5 2EA | | Map & Directions |
| Initial Electronic Security Systems Ltd | 020 8880 4300 | | Unit 261 Lee Valley Technopark, Ashley Road, London, N17 9LN | | Map & Directions |
| Boss Security Services Ltd | 020 8493 8562 | | Imperial House, 64 Willoughby Lane, London, N17 0SP | | Map & Directions |
| Mls Security Systems | 020 7987 5757 | | 3 Manchester Road, London, N15 6HP | | Map & Directions |
| A M Architectural & Structural Metalworks | 020 8808 7821 | | 46 Chalgrove Road, London, N17 0JD | | Map & Directions |
| Lipcom | 020 8800 8889 | | 33 Craven Walk, Watermint Quay, London, N16 6DN | | Map & Directions |
| Rentokil Initial Security | 020 7697 2250 | | Unit 2 Kings Exchange, Tileyard Road, London, N7 9AH | | Map & Directions |
| Sqs | 020 8444 8984 | | 7a Southwood Hall, Muswell Hill Road, London, N6 5UF | | Map & Directions |
| Celebrity Protection | 020 7561 0101 | | Unit 903 Oxford House, 49a Oxford Road, London, N4 3EY | | Map & Directions |
| Securzone Security Ltd | 020 8808 0178 | | Imperial House, 64 Willoughby Lane, London, N17 0SP | | Map & Directions |
| Electrotect Security Systems | 020 8444 5204 | | 32 Lankaster Gardens, London, N2 9AJ | | Map & Directions |
| Farm View Systems | 020 8343 9120 | | Friern Park, The Lindens, London, N12 9DJ | | Map & Directions |
| Aminex Security Services Ltd | 020 8493 8115 | | 19 Elsden Road, London, N17 6RY | | Map & Directions |
| M 1 Security Ltd | 020 8447 8345 | | 14 Aldermans Hill, London, N13 4PN | | Map & Directions |
| Abbot Data Store Ltd | 020 7607 0222 | | Abbot House, 14-22 Vale Royal, London, N7 9AU | | Map & Directions |
| Euroguard Security Services Ltd | 020 8493 8115 | | Unit 62, Mill Mead Road, Milmead Industrial Centre, London, N17 9QU | | Map & Directions |
| Bdi Securities Ltd | 020 8884 2424 | | Unit C1 Hastingwood Trading Estate, 35 Harbet Road, London, N18 3HU | | Map & Directions |
| D C Communications | 020 8346 4746 | | 44 Beechwood Avenue, London, N3 3AX | | Map & Directions |
| Caretrend Rentals Ltd | 020 8455 7757 | | 9 Deacons Rise, London, N2 0BF | | Map & Directions |
| London Keyholding Co Ltd | 020 7691 9876 | | Unit 15 Kings Exchange, Tileyard Road, London, N7 9AH | | Map & Directions |
| Watchdog Fire & Security | 0800 389 9725 | | 15 Park Avenue, London, N3 2EJ | | Map & Directions |
| Eurotech Monitoring Services Ltd | 020 8881 3066 | | 1 St. Michael's Terrace, London, N22 7SJ | | Map & Directions |
| Securidor Total Security Systems Ltd | 020 8492 0040 | | 224 Woodhouse Road , North Finchley, London, N12 0RS | | Map & Directions |
| Scorpion Security Services | 020 7272 4185 | | 1 Stroud Green Road, London, N4 2DQ | | Map & Directions |
| Cctv Solutions Ltd | 020 8446 9581 | | Rex House, 354 Ballards Lane, London, N12 0DD | | Map & Directions |
| Tottenham Lock & Safe Co | 020 8884 1123 | | 52 Harrow Drive, London, N9 9EW | | Map & Directions |
| Video Security Systems | 020 8446 5296 | | 113 Holden Road, London, N12 7DF | | Map & Directions |
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