| Matrix Security & Electrical Systems Ltd | 020 8744 2244 | | 8 Lion Road, Twickenham, TW1 4JQ |  Map & Directions |
| P T I | 020 8892 6317 | | Unit C1, Rugby Road, Twickenham Trading Estate, Twickenham, TW1 1DQ | | Map & Directions |
| Knighthood Security Systems Ltd | 01932 780095 | | Kempton Park House, 17-19 Park Road, Sunbury On Thames, TW16 5BX | | Map & Directions |
| Intrepid Ltd | 020 8893 9922 | | Unit 13, Millfield Road, Mill Farm Business Park, Hounslow, TW4 5PY | | Map & Directions |
| Spy Shop | 0871 781 0223 | | Crest House, 102-104 Church Road, Teddington, TW11 8PY | | Map & Directions |
| First Choice Facilities Plc | 020 8568 6622 | | 1 Linkfield Road, Isleworth, TW7 6QG | | Map & Directions |
| C D Telecom | 020 8847 6222 | | Unit 9, Alexandra Road, Red Lion Court, Hounslow, TW3 1JS | | Map & Directions |
| Universal Smart Cards | 01932 724070 | | Brooklands Cl, Sunbury On Thames, TW16 7DX | | Map & Directions |
| Network Video Technologies | 020 8541 1717 | | 99 Waldegrave Road, Teddington, TW11 8LA | | Map & Directions |
| A Powerplus | 020 8255 5550 | | 52 Wensleydale Road, Hampton, TW12 2LT | | Map & Directions |
| Icts Ltd | 020 8564 8461 | | Room 1073, 1074, D'Albiac House, Cromer Road , Hounslow, TW6 1QS | | Map & Directions |
| Liaise Ltd | 01784 481254 | | 27 Poulcott, Wraysbury, Staines, TW19 5DN | | Map & Directions |
| Detroit Security Systems | 020 8814 2929 | | Telephone Exchange, Holloway St, Hounslow, TW3 1BB | | Map & Directions |
| Securitas Guarding Services Ltd | 020 8392 6000 | | 203-207 Lower Richmond Road, Richmond, TW9 4LN | | Map & Directions |
| 2nd Sight Cctv Ltd | 01784 483869 | | 26a Riverside, Wraysbury, Staines, TW19 5JN | | Map & Directions |
| Reliance Security Services Ltd | 020 8894 4100 | | 150 Hampton Road West, Feltham, TW13 6BE | | Map & Directions |
| Asgard Security Management Services | 020 8893 8510 | | 17 Tranmere Road, Twickenham, TW2 7JD | | Map & Directions |
| Securitas Ltd | 020 8893 1600 | | 3 Maple Way, Maple Industrial Estate, Feltham, TW13 7AW | | Map & Directions |
| Photo-Scan Ltd | 01932 898500 | | Windmill Road West, Dolphin Estate, Sunbury On Thames, TW16 7HG | | Map & Directions |
| P S S Aviation Support Ltd | 020 8831 9888 | | Ciba House, Dick Turpin Way, Feltham, TW14 0PS | | Map & Directions |
| Meteor Security | 020 8759 6860 | | Northern Perimeter Road, London Heathrow Airport, Hounslow, TW6 2RL | | Map & Directions |
| G J A Security Ltd | 01784 490871 | | 1 Mede Court , Moor Lane , Staines, TW18 4YU | | Map & Directions |
| C D Security Systems | 020 8572 6982 | | Unit 9, Alexandra Road, Red Lion Court, Hounslow, TW3 1JS | | Map & Directions |
| H S Security Ltd | 01784 247700 | | Littleton House, Unit 28 Littleton Road, Ashford, TW15 1UU | | Map & Directions |
| Verdant Technologies | 01932 267076 | | Unit 8 Terminal House, Station Approach, Shepperton, TW17 8AS | | Map & Directions |
| Chubb Electronic Security Ltd | 01932 785588 | | Po Box 233, Sunbury On Thames, TW16 7XY | | Map & Directions |
| G D Security Systems Ltd | 01483 267860 | | 4 Hailey Place, Twickenham, TW2 7DX | | Map & Directions |
| A & A Security Technologies Group | 020 8751 5870 | | Browells Lane, Feltham, TW13 7EQ | | Map & Directions |
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