| Initial Aviation Security Ltd | 01895 438107 | | 41 High Street, Yiewsley, West Drayton, UB7 7QQ |  Map & Directions |
| Initial Security Ltd | 01895 436262 | | High Street, Yiewsley, West Drayton, UB7 7QQ | | Map & Directions |
| Image Security Ltd | 01895 442000 | | Bentinck Road, West Drayton, UB7 7RQ | | Map & Directions |
| Jet Security | 020 8422 5552 | | 28 Horsenden Lane North, Greenford, UB6 0PA | | Map & Directions |
| Knighthood Security Systems | 020 8423 5677 | | 209 The Heights, Northolt, UB5 4BX | | Map & Directions |
| Jai Ltd | 01895 821481 | | Zone M, Quay West, Salamander Quay, Harefield, Uxbridge, UB9 6NZ | | Map & Directions |
| Reliance Security Services Ltd | 01895 205000 | | Boundary House, Cricket Field Road, Uxbridge, UB8 1QG | | Map & Directions |
| Scantronic Ltd | 020 8566 7555 | | Unit 24c-D Perivale Industrial Park, Horsenden Lane South, Greenford, UB6 7RJ | | Map & Directions |
| 1st Point Uk Ltd | 020 8569 0432 | | Lowdham Lodge, Pole Hill Road, Uxbridge, UB10 0QE | | Map & Directions |
| Amission Ltd | 020 8998 0099 | | Wadsworth Business Centre, Wadsworth Road, Perivale, Greenford, UB6 7LQ | | Map & Directions |
| Andromica Video Systems Ltd | 01895 257971 | | Threaf House, 54 Wallingford Road, Uxbridge, UB8 2RW | | Map & Directions |
| Becon Security Products Ltd | 020 8991 2242 | | Unit 12, Wadsworth Road, Sheraton Business Centre, Perivale, Greenford, UB6 7JB | | Map & Directions |
| Marway Telephone Services | 020 8571 5073 | | 144 Regina Road, Southall, UB2 5PP | | Map & Directions |
| Electronic Broadcast Ltd | 020 8998 2030 | | Apparel House, 26 Wadsworth Road, Greenford, UB6 7JD | | Map & Directions |
| C S L Communications Ltd | 01895 474474 | | Quay West, Salamander Quay, Harefield, Uxbridge, UB9 6NZ | | Map & Directions |
| C J L Exec | 0870 011 4305 | | Research House, Fraser Road, Greenford, UB6 7AQ | | Map & Directions |
| Joda Security Services Ltd | 020 8574 6816 | | Windmill Place Business, 2-4 Windmill Lane, Southall, UB2 4NJ | | Map & Directions |
| Rayitson Communications | 020 8574 4340 | | 17 Balfour Road, Balfour Business Centre, Southall, UB2 5BD | | Map & Directions |
| Ambush Security Systems | 020 8743 1356 | | Breakspear Road South, Ickenham, Uxbridge, UB10 8HB | | Map & Directions |
| Cobalt Security Ltd | 020 8848 4700 | | 4 Cranford Park Road, Hayes, UB3 4PF | | Map & Directions |
| Octagon Security | 01895 624545 | | 87 High Road , Ickenham, Uxbridge, UB10 8LH | | Map & Directions |
| Security Dynamics | 020 8997 6225 | | Unit 19, Wadsworth Road, Silicon Business Centre, Greenford, UB6 7JZ | | Map & Directions |
| Express Securities Ltd | 01895 446838 | | 41 St. Clement Close, Uxbridge, UB8 3SS | | Map & Directions |
| Denver Security Services | 0845 948 5868 | | 1-2 Oxford Road, Denham Parade, Denham, Uxbridge, UB9 4DZ | | Map & Directions |
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