CRH Fencing & Security Group is the largest player in the perimeter protection systems market. The group offers clients the opportunity to streamline their supply chain and source all of their perimeter security requirements from one single organization. The perimeter security includes fencing, intruder detection, entrance controls and security management.

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.

Cyberhomes is a UK-based provider of smart home installations including CCTV and security applications.

Cytix is a cloud vulnerability management platform and a cluster of dedicated pentesters to help identify & resolve vulnerabilities.

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.

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.

DC Solutions is a CCTV installer based in Luton.

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.

Direct CCTV and Security Systems Ltd specializes in design, installation and maintenance of best bespoke security systems for commercial and domestic market. Direct CCTV offers CCTV, access control, intruder detection, door entry, biometrics, integrated security, maintenance, and additional services. Robust security solutions are delivered for all types of business, to inspire confidence in protection of business premises and staff.

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.

ESS is an independent company specializing in all aspects of care alarms and electronic security systems, based in Earith, Cambridgeshire. The company also offers electronic access control solutions ranging from one door to multiple sites using LAN or internet connections, including full software control for BMS systems with card ID printing and door alarm mapping facilities.

Electrical, Fire, & Security services to a diverse range of customers. As a forward thinking company it also offers bespoke systems that meet varying operational requirements.

ECHO operates to fullfil Bluelight Services interest in speeding up the police response to verified alarm activations through the use of digital automated alarm transmission technology. Its digital communications hub provides an automatic transfer to police control rooms of confirmed intruder and hold-up alarm activations, faster alarm verification, accurate incident information, and automated event incident acknowledgment.

Electronic Security Installations Ltd is a specialist security installation company. The company's clients include private homes, shops, large offices, industrial sites, schools and medical units. ESI is accredited by the Security Systems Alarms Inspection Board (SSAIB) for installing and servicing intruder alarms. Based in the North West Electronic Security Installations cover Cheshire, Derbyshire, Greater Manchester and all surrounding areas.

Electronic Security Systems and Fire Protection Ltd provides service and maintenance facilities for utility companies in the UK, telecommunications providers, primary care trust sites, major UK hotel chains, along with chains of fashion and convenience stores. The company's team of trained technicians are fully conversant in installation, service, maintenance and commissioning of fire alarms, CCTV, intruder detection and access control systems.

Established in 2001, Eligo Security is a specialist recruitment company that fulfills security recruitment needs. The company helps find engineering, sales, technical support, marketing, R&D, design, project management, admin and senior management.

Equiniti is a global provider of technology and solutions for complex and regulated administration, serving blue-chip enterprises and public sector organizations. Equiniti is known to ensure smooth business and operations for renowned brands and public sector organizations. They also provide cybersecurity solutions for enterprises via their own in-house cybersecurity platform, Zero.

Exidor Ltd is a UK based architectural ironmongery company manufacturing a comprehensive, high specification range of panic and emergency exit hardware, door closers and builder’s ironmongery. Exidors range of quality door closers includes overhead and electromagnetic closers, floor springs and transom closers.

Fairlea is an experienced and innovative company focusing on the supply and installation of Ajax security solutions. They are a local alarm experts and caring about homes or business properties is their priority. As an NSI-registered company, they understand the sheer importance of security and fire safety while being technically competent, professional, and trusted in all that they do.

Based in Milton Keynes, Firesand Ltd provides penetration testing services to improve cyber security and protect the company against hackers.

First City Care was established in 1986 primarily in response to an increasing requirement to install a variety of security and safety equipment covering electronic, technical and physical installations in both modern and historic office buildings in the City of London. The company offers access control, video surveillance, intruder detection systems as well as maintenance and servicing facility to its clients.

Focus Fire & Security Ltd install and maintain security systems for industry and commerce, with QUALITY being the key issue. The company operates from premises in the north of Liverpool with an engineering base covering the whole of the North of England.