| Pro-Loc | 01753 705030 | | Royal Albert House, Sheet Street, Windsor, SL4 1BE |  Map & Directions |
| Ace Thames Security | 01753 830442 | | 40 Albany Road, Old Windsor, Windsor, SL4 2QA | | Map & Directions |
| Castle Care-Tech Ltd | 01344 887788 | | Stableway, North Street, Winkfield, Windsor, SL4 4SY | | Map & Directions |
| Spy Shop | 0871 781 0234 | | The Call Centre, Victoria Street, Windsor, SL4 1YB | | Map & Directions |
| Atlas Security Doors | 01753 830385 | | 16 Bridgewater Way, Windsor, SL4 1RD | | Map & Directions |
| Shop Alert Ltd | 01344 885759 | | Stableway, North Street, Winkfield, Windsor, SL4 4SY | | Map & Directions |
| Griffin Grilles & Shutters | 01753 652129 | | Maryfields, Bangors Road North, Iver, SL0 0BH | | Map & Directions |
| Banham Burglary Prevention Ltd | 01628 784151 | | 36 High Street, Maidenhead, SL6 1QE | | Map & Directions |
| International Security & Surveillance Ltd | 01628 667545 | | 4 Whittle Parkway, Progress Business Centre, Slough, SL1 6DQ | | Map & Directions |
| Delta Synergistics Security Systems Ltd | 01753 883627 | | Delta House, Gold Hill West, Chalfont St. Peter, Gerrards Cross, SL9 9HH | | Map & Directions |
| Aaaa Lester Alarms | 01628 635227 | | 1 North Town Moor, Maidenhead, SL6 7JR | | Map & Directions |
| Britannia 2000 Ltd | 01628 829356 | | Grove Park Industrial Estate , Waltham Road , White Waltham, Maidenhead, SL6 3LW | | Map & Directions |
| Robinson Foster Associates | 01494 513516 | | Clay Lane, Booker, Marlow, SL7 3DT | | Map & Directions |
| Falcon Security Systems Ltd | 01628 481747 | | Walnut House, Dean Lane, Cookham, Maidenhead, SL6 9AG | | Map & Directions |
| Sword Services Ltd | 01753 517200 | | Wexham Road, Business Village, Slough, SL2 5HF | | Map & Directions |
| Wyse Electrical Co | 01628 824717 | | Unit 1, Woodlands Business Park, Woodlands Park Avenue , Maidenhead, SL6 3LT | | Map & Directions |
| Group 4 Security Systems Ltd | 01753 694455 | | 226 Berwick Avenue, Slough, SL1 4QT | | Map & Directions |
| Premier Service Securities | 01753 579770 | | 64a High Street, Slough, SL1 1EL | | Map & Directions |
| Precision Electric Services | 01753 884100 | | 3 Lovel Road, Chalfont St. Peter, Gerrards Cross, SL9 9NW | | Map & Directions |
| E D M Electrical Services | 01753 675145 | | 148 Northborough Road, Slough, SL2 1TA | | Map & Directions |
| Touchstone | 01753 685237 | | 12 Newlands Drive, Colnbrook, Slough, SL3 0DX | | Map & Directions |
| Group 4 Total Security Ltd | 01753 822282 | | 226 Berwick Avenue, Slough, SL1 4QT | | Map & Directions |
| Wilson James Ltd | 01628 550700 | | Unit 7, Lake End Court, Taplow Road, Taplow, Maidenhead, SL6 0JQ | | Map & Directions |
| Pack's Infotel Ltd | 01344 874114 | | 1 Broomfield Hall Buildings, London Road, Sunningdale, Ascot, SL5 0DP | | Map & Directions |
| Southern Electrical Services Ltd | 01753 891924 | | 8 Oak End Way, Gerrards Cross, SL9 8BR | | Map & Directions |
| 4 Front Security Services Ltd | 01628 850632 | | Suite 120, 5 The High Street, Maidenhead, SL6 1JA | | Map & Directions |
| Amber Alarm Systems | 01753 554794 | | 1 Red Lion Cottages, Stoke Green, Stoke Poges, Slough, SL2 4HP | | Map & Directions |
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