| Express Security Systems | 020 7377 6565 | | 88 Vallance Road, London, E1 5BW |  Map & Directions |
| Trident Safeguards Ltd | 020 7522 0999 | | Cardinal Court, 23 Thomas More Street, London, E1W 1XY | | Map & Directions |
| Lynx Security Services | 020 7680 5400 | | 100 Christian Street, London, E1 1RS | | Map & Directions |
| Mighty Trident Security Ltd | 020 7522 0999 | | Cardinal Court, 23 Thomas More Street, London, E1W 1XY | | Map & Directions |
| Rainbow Security Services Ltd | 020 8534 2534 | | 2 Windmill Lane, London, E15 1PG | | Map & Directions |
| Herring Reader Security | 020 8981 7944 | | 175 Bow Road, Bow, London, E3 2SG | | Map & Directions |
| Mls Security Systems Ltd | 020 7987 5757 | | 3 Manchester Road, London, E14 3BD | | Map & Directions |
| Silverline Security | 020 7254 8103 | | 129 Kingsland High Street, London, E8 2PB | | Map & Directions |
| Westwood International Ltd | 020 8503 0901 | | 287 Romford Road, London, E7 9HJ | | Map & Directions |
| Etech Security Installations | 07973 667345 | | 117 Stokes Road, London, E6 3SF | | Map & Directions |
| Fems Protection Services | 020 8418 5720 | | 5 Blackhorse Lane, London, E17 6DS | | Map & Directions |
| V E M Security Systems | 020 8531 2111 | | 50 Alma Avenue, London, E4 9JT | | Map & Directions |
| Black & White Security Co Ltd | 020 7515 1247 | | Gillender Street, London, E14 6RN | | Map & Directions |
| Choice Security Solutions | 020 8527 5177 | | Unit 3 Curlew House, Trinity Way, Trinity Park, London, E4 8TD | | Map & Directions |
| Technology Management Ltd | 020 7537 4884 | | Lutomer House Business Centre, 100 Prestons Road, London, E14 9SB | | Map & Directions |
| Brooknight Guarding Ltd | 020 7345 5135 | | 4d, 10-16 Tiller Rd/docklands Business Centre, London, E14 8PX | | Map & Directions |
| Total Security Installations Ltd | 020 7511 5555 | | Unit 3 Datapoint Business Centre, 6 South Crescent, London, E16 4TL | | Map & Directions |
| Reliance Security Services Ltd | 020 7536 1320 | | Second Floor, 31 Pepper Street, London, E14 9RP | | Map & Directions |
| Exodus Security Services Ltd | 020 8519 8989 | | Channelsea Business Centre, Channelsea House, Canning Road , London, E15 3ND | | Map & Directions |
| A1 Security Ltd | 020 8539 9800 | | Unit 41, Lammas Road, Fairways Business Park, London, E10 7QB | | Map & Directions |
| Delta Security | 020 8558 5522 | | 162 B Midland Road, Railway Arches, London, E10 6JT | | Map & Directions |
| Grant Security | 020 8558 9067 | | Flat 10 St. Luke's Court, 45 Capworth Street, London, E10 5BQ | | Map & Directions |
| Mediacoms Ltd | 0808 155 6192 | | Unit 5 Rear Of Picks Cottage, Sewardstone Road, London, E4 7RA | | Map & Directions |
| Bates Alarms | 020 8980 4710 | | The Coach House, Tredegar Mews, London, E3 5AF | | Map & Directions |
| St Michael Security Ltd | 07961 314759 | | 51, Runnymede House, Homerton Road , London, E9 5PS | | Map & Directions |
| S2 Securities | 020 7093 2951 | | 46 Limeharbour, Skylines Village, London, E14 9TS | | Map & Directions |
| Siren Security Ltd | 020 8925 6902 | | 1d Willow Street, Chingford, London, E4 7EG | | Map & Directions |
| Bromshield Security | 020 7363 6707 | | 2 Skylines, Limeharbour, Docklands, London, E14 9TS | | Map & Directions |
| Thames Manufacturing Co Ltd | 020 8522 0064 | | Unit 354 Stratford Workshops, Burford Road, London, E15 2SP | | Map & Directions |
| D M Security Ltd | 020 7511 7600 | | 105 Barking Road , London, E16 4HQ | | Map & Directions |
| Imperial Knights Ltd | 020 7863 7513 | | Suite 17 Ensign House, Admirals Way, London, E14 9XQ | | Map & Directions |
| Securewatch | 020 8815 8100 | | Upper Clapton Road, Station Parade, London, E5 8BD | | Map & Directions |
| North London Fire & Security Systems | 020 8533 7733 | | 69 Chatsworth Road, London, E5 0LH | | Map & Directions |
| Allied Security Systems | 020 8989 9971 | | 41 Dover Road, London, E12 5DZ | | Map & Directions |
| Tringmain Security | 020 8533 0516 | | 203-213 Mare Street, London, E8 3QE | | Map & Directions |
| Aston Security | 020 8527 6888 | | Clifford Road, Walthamstow Business Centre, London, E17 4SX | | Map & Directions |
| Pro-Sec Fire & Security Plc | 020 7473 0132 | | 265 Barking Road, London, E13 8EQ | | Map & Directions |
| High Profile Security Ltd | 020 8533 3331 | | 102 Chatsworth Road , London, E5 0LS | | Map & Directions |
| Protech Alarms Ltd | 020 8553 3899 | | 812 Romford Road, London, E12 5JG | | Map & Directions |
| London East Security Centre Ltd | 020 8553 9000 | | 639-643 Romford Road , London, E12 5AD | | Map & Directions |
| Newlands Services Ltd | 020 8555 4651 | | Unit 155 Stratford Workshops, Burford Road, London, E15 2SP | | Map & Directions |
| Security & Communication Specialists Ltd | 020 8586 0066 | | 527 Barking Road, London, E6 2LN | | Map & Directions |
| Top Dog Security | 0800 783 5534 | | 20 High Road Leyton , London, E15 2BP | | Map & Directions |
| Saturn Security Ltd | 020 8534 6004 | | Channelsea Business Centre, Canning Road, London, E15 3ND | | Map & Directions |
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