DataScope is one of the UK’s leading providers of temporary site access control and time and attendance systems for the construction sector. The company supports some of the largest and prestigious construction and security companies on major development projects all over the UK.

Datastor integrate the best in proprietary equipment and software products to provide not only the optimum solutions to their clients individual needs but also one which communicates seamlessly with other key applications.

Davis Derby is a long established designer and manufacturer of intrinsically safe electronics and explosion-proof electrical equipment. Davis Derby supplies a specialized range of control and monitoring equipment products for use in the mining industry to improve safety and productivity in this hazardous industrial environment.

- Founded in 2009, Deep Secure is privately owned UK-based security software solutions firm. Services offered include Content Threat Removal, Content Transform, Policy Enforcement, Cyber Security, Data Security, Email Content Security, Web Content Security, Portal Protection and Deep Content Inspection.

Defence Doors is a Yorkshire based UK steel fabrication company with over 20 years of experience manufacturing flood gates, blast doors and prison doors. The company also offers electronic security, electric locking systems, video and intercom systems, CCTV systems, and perimeter intruder detection systems etc.

Deister Electronic Ltd is one of the world's leading companies in the development, manufacture and marketing of electronic security and identification products.

Demux Video Services Ltd is a leading forensic multimedia analysis and software company, specializing in the clarification and Demultiplexing of CCTV images and footage as well as audio material.

Derwent Systems is a industry leader in the field of Infra-Red technology - an essential element for effective night-time CCTV surveillance and ANPR.

Design Automator is a SaaS solution for the security systems industry that automates the engineering process, eliminates human error and delivers system wide consistency, whilst saving both time and money.

Detectortesters is a designer and manufacturer of testing technology for fire detection systems. In-house expertise across a range of technical disciplines means they are able to constantly innovate and develop new technology to bring new ideas and solutions to both users of their products and anyone with a responsibility for fire safety.

Detego Global is the company behind award-winning Digital Forensics, Case Management, and Endpoint Monitoring solutions that are trusted by the military, law enforcement teams, intelligence agencies, and enterprises around the world. With the ever-increasing use of digital devices and the corresponding mass of data that are created, solutions have become the preferred choice for rapidly acquiring and analyzing.

DeterTech is an award-winning risk management company that uses proprietary technology-based solutions to deliver material cost savings for clients operating nationally in the infrastructure, construction, vacant property, and other sectors, across a range of security products and services.

deView Europe is a premier imaging and sensing company, part of the world's premier OEM/ODM CCD camera and LCD monitor provider. The group actively supports and services customer relationships through offices based in Europe, North America and Asia. The company is a leading provider of LCD panels, day night cameras, wide dynamic cameras, recorders, ancillary products and more.

DGS is managed and operated by this team who take a real hands on approach to all the operational aspects of each and every contract. DGS Service Solutions provide a range of outsourced Security, Cleaning and FM Solutions to a range of customers including shopping centers, offices, factories, and retail outlets.

Digi provides the industry’s broadest range of wireless products, a cloud computing platform tailored for devices, and development services to help customers get to market fast with wireless devices and applications.

Digital Barriers was established in 2009 to provide advanced surveillance technologies to the international homeland security and defense markets. The company brings innovative new thinking and solutions to the protection of most critical national assets, locations and infrastructure.

Digital CCTV Ltd. is a UK based technology company with many years of experience. Digital CCTV has developed intelligent security and communication technology solutions since 1998 and is well placed to advise customers on applications and system designs.

Digital Locksmiths Limited was founded by two former members of Smart Card Solutions: Sean Kelly & Martin Strauch. The Digital Locksmiths offer an unrivalled, independent capabiltity to help our clients provide the highly reliable, feature rich and cost effective products that customers demand.

Through their 24/7 Security Operations Centre, DigitalXRAID delivers cyber security strategies to organizations that enhance the security posture and reduce the risk, cost, and reputational damage of a breach.

Dimension Productions Limited is a UK manufacturer of the handySet portable color, battery powered test monitor, including the new HandySet technical portable test monitor. DPL is a design consultant for closed circuit television CCTV systems, project managers, technical writers for CCTV installations and programmers of bespoke software for the CCTV industry.