Crimewatch Safeguard Security Systems specialise in Intruder Detection, Fire Detection, Access Control, and Closed Circuit Television (CCTV) installation, monitoring, and design to both the public and private sector.

Founded in 1970 as a family-run business, Croma Fire & Security has been providing extensive expertise in fire safety and security solutions for over half a century. They maintain an unrivalled knowledge of new and existing security technology, enabling them to deliver the most effective and comprehensive security solutions.

Croma Security Solutions Group PLC (CSS Group PLC) is an AIM-quoted total security services provider. The company specialises in guarding, electronic security, CCTV, intruder alarms, video analytics, access control, Biometrics, keyholding, close protection, fire alarms, revenue parking, private investigation, locksmithing, and physical security. CSS' Fastvein Time & Attendance is a biometric attendance and people clocking solution.

Crosby Intruder Alarms offer full design, installation, service, repair and maintenance to hardwired alarm systems, CCTV, access control, security lighting, fire alarms, local area paging, caravan park security, and door entry systems.

Crown Security Systems designs, builds, installs, and maintains intruder alarms, fire alarms, CCTV, access control to current British and European Standards.

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.

Custom Security Services is one of the South's leading independent providers of fire, security and safety systems. The company offers a comprehensive design, installation and maintenance service for all types of security related projects. With over 25 years experience the company has successfully delivered thousands of quality installations to all types of customers, including domestic, commercial, and public sector.

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.

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 centres, 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.

Since its formation in 1989, Davies Security Group has been designing bespoke security systems for its clients from all areas of the marketplace. From standalone Fire, Intruder and CCTV systems to PC-based integrated solutions, Davies Security can provide for all specifications, incorporating the latest technology from the fast moving security sector designed individually to accommodate present and future security needs.

DC Solutions is a CCTV installer based in Luton.

Detection Security Systems offers complete range of specialist electronic fire & security systems to meet the ever changing needs of residential, commercial, retail and industrial clients. The company provides products and services such as intruder alarms, CCTV systems, access control, fire alarms, alarm monitoring, gate automation as well as service and maintenance.

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.

Direct Security provides Integrated systems, CCTV, access control, door entry, intruder alarm, fire systems, personal attack systems, photo-id, vehicle recognition ANPR, structured cabling, networked systems, asset management, project management, data management, software development, consultancy, and system auditing services. Direct Security is an ISO 9002 quality assured company and NACOSS Gold and Construction Line accredited.

Established in 1982 Direct Security Systems has earned an excellent reputation for providing security products and services in Wolverhampton, Walsall and surrounding areas in West Midlands. The company provides high performance intruder alarms, area detectors for residential, commercial & industrial needs, control panels that react to change, access control systems, card readers & keypads, CCTV & 24 hour monitoring services, fire alarm systems.

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

Domalarms is a family owned and run company. The company has its head office in Leeds on the outskirts of the city centre. Domalarms deals in all aspects of home, business and commercial security designing, supplying, and installation including burglar alarms, intruder prevention systems, CCTV systems, access control systems, automatic lighting, electrical services, fire alarms, and automated gates and barriers.

The new combined Dorset & Wiltshire Fire and Rescue Service came into being on 1 April 2016, and now serves the local authority areas of Bournemouth, Dorset, Poole, Swindon and Wiltshire. They are ‘passionate about changing and saving lives’ – and are excited by the possibilities that are now open to them as a larger Fire and Rescue Service.

DPE Systems is a UK-based CCTV and electronic security systems company based in Bolton, Lancashire. The company provides security solutions for both domestic and commercial customers, with services covering the design, supply, installation, and servicing of electronic security systems.

Dräger is a leading international company in the fields of medical and safety technology. Dräger provides firefighters all around the world with state-of-the-art equipment, services and training.

Dragon Fire & Security Systems is one of South Wales' largest independent fire and intruder alarm installers. The company offers intruder alarm, fire alarm, CCTV, remote monitoring (off-site), automatic gates and barriers, access control and door entry, emergency lighting systems' services. Dragon Fire & Security Systems is approved to all industry's highest recognised standards including NSI (NACOSS GOLD) and BAFEFire Alarm Certification Scheme.

UK's Dragon Security Systems designs, installs and maintains security systems including CCTV surveillance, fire detection, intruder detection, and access control for commercial and domestic use. The company is NSI Gold approved and quality insured to provide the highest standard possible. Dragon Security Systems also schedules regular preventive maintenance checks to both its own installations and those systems installed by other companies.

DS Securities is one of the leading independent security and fire specialists in the UK. The company aims to provide a range of innovative, reliable and dependable security, fire, CCTV, access control, network and IP technology solutions, specifically designed, installed and maintained to highest standards for customer’s individual needs. DS Securities' clients include individual home owners, small businesses and large corporations.

DS Security is a pioneer UK Security company providing Security Services throughout the United Kingdom. Their security camera systems, access control and asset protection solutions provide a real deterrent and the peace of mind having a full record of any event or problem if needed.

Cornwall CCTV, fire and security specialists, Duchy Alarms, offers a professional installation and maintenance service for a wide range of fire and security alarms and systems throughout the South West of England. Duchy Alarms has been serving the domestic and commercial industry throughout Devon and Cornwall. Previous clients include the RNLI, National Probation Service, and various Schools, Colleges, and NHS hospitals.