Established in 1971, Crane Electronics has been delivering solutions for torque management and control problems for 50 years. Crane’s product range covers wrenches, transducers, data collectors, torque testers, tool testing benches and system software.

Crime Prevention Products (CPP) is a retail and wholesale supplier of personal alarms, defense sprays, wireless burglar alarms, dummy cameras and home/vehicle and office security products. The company offers a wide range of personal safety alarms ultraviolet lamps, door security, window security, counterfeit detection equipment, security hardware, etc. CPP is a preferred supplier for NHS, Local Authorities, Schools , Police Forces, etc.

CSG UK PLC specialize in the installation, maintenance and support of security systems for companies and organizations throughout the UK and Europe. CSG UK supply and install comprehensive security systems for national chains and individual businesses in the form of: CCTV, Access Control, Public Address, Intruder Detection and EAS (Electronic Article Surveillance), Fire and Safes.

Cube Training delivers security training courses, workshops and seminars in London. It is a specialist security training provider in the following areas: CCTV installation & maintenance, burglar alarm installation & maintenance, network security and basic access control. Cube Training has installed CCTV systems in shops, supermarkets, office buildings, industrial places, homes and more.

D.W. Price Security was established in 1998 by the current directors who each have more than 30 years experience within the physical security sector. They are the 3rd generation of the original family business, with roots based in the original glass and glazing industry with the first security installations carried out in the early 1970s.

D&D Security Derby offers fully licensed SIA-approved security guards that are ready to be deployed within hours upon acceptence. It provides approved contractor security services for major companies across the UK. Specialists in static guarding, it offers a cost-effective security service for the protection of UK businesses.

DA Security Systems are a family run CCTV, Fire and Alarm Business. It has been operatiing from Lee-on-the-Solent in Hampshire, UK since 1984. It has over 40yrs experience with the installation and maintenance of CCTV, Fire Alarm, Intruder Alarm, Door Entry and Nurse Call systems.

Daifuku Airport Technologies is a solutions provider for airports worldwide. They specialize in airport operations and maintenance, baggage handling, self service technology, automated bag drop, baggage tray systems, tilt tray sorter, mobile inspection Table, early bag storage, hold bag screening, RFID and other solutions.

Dante provides project management services as well as commercial fire and security systems throughout the UK. The company has mechanical and construction divisions. Dante has achieved the quality standard ISO9001 and environmental standard ISO 14001. The company's specialisms include CCTV, door entry, intruder alarms, fire safety, and PA/VA.

DAS Technology can design, install and maintain security systems for a wide range of uses from homes, shops and offices to shopping centers, schools and car parks. They provide bespoke security solution that meets your needs, and all completely hassle free. Their nationwide network of engineers is trained to the highest standard in order to install security systems with a professional, efficient and reliable service.

DAS Technology are technology specialists with over a decades experience delivering solutions for both commercial and domestic customers. Their security division is full of specialists in CCTV, access control, door entry and fire.

DC Solutions is a CCTV installer based in Luton.

Delaney Secure Ltd is an IT security distributor specializing in biometric authentication, door entry systems and PCI DSS compliance. Leading stockist of door entry solutions, time and attendance, fingerprint readers, palm vein readers, iris scanners, face recognition and OEM biometric hardware and software solutions.

Delta Tec Alarms delivers high-quality alarm systems and reliable alarms to customers. The company advises customers on the products that best serve their security needs.

Device Smart Ltd. have been developing Monitoring and Control Software & Middleware Platforms for over 15 years before cloud, before IOT, before "smart anything" was a buzz word.

The Digital RF offers two unique comprehensive detection systems for entrance security control. These systems offer of a number of automatic inspection and detection processes which enable the identification of suspect vehicles which may be equipped with I.E.D’s and Magnetic Bombs or Tracking Devices.

Direct Trade Supplies supplies consumer units, CCTV, heating, timers, low energy LEDs, lighting, access control systems, fire protection systems & lots more from top manufacturers.

Discount Locks offers quality locks and accessories from major brand products that cover all areas of your home and office including doors, windows, patio doors and garages.

DOM-UK Ltd. focuses on developing and offering high quality mechanical and access control solutions for residential and commercial applications. They provide smart access control, mechanical and digital locking solutions, including locks, lockcases, digital handles and cylinders, wall readers and terminals, trapped key interlocking systems and anti-tilt systems.

Established in 1997, Door Controls Direct is a UK specialist online supplier of electromagnetic door closers and door control equipment with access to thousands of door hardware products. It also supplies digital locks, access control, electric locking, power supplies, and automatic door operators, as well as door hardware and fire escape hardware for buildings to comply with fire safety and security regulations.