CIS Security initially operated as a security management and commercial investigation specialist. In 1972, the company joined the manned guarding industry when customers found it difficult to find a suitable security company to provide professional security personnel with the ability to fulfil the recommendations/positions proposed by their experts.

The UK’s City Alarms specialises in the repair of old security systems. The company also offers intruder alarms, CCTV systems, access control, fire detection systems, door entry systems and locksmith services.

City Electrical Factors Ltd is a private limited company established in 1951. They are the United Kingdom’s leading Electrical Wholesale Network with almost twice as many distribution outlets as their nearest competitor.

CGS is a dynamic and professional FM company, specialising in customer focussed security provisions and cleaning specialists. Its security services range from bespoke security officer services, fire wardens and waking watch, mobile services, and its own K9 Patrol Dog Handling arm.

City Lock and Safe Ltd was founded in 1957, and has established itself as one of the North West's leading locksmiths and suppliers of security products. City Lock and Safe Ltd., provide a wide range of security equipment and services to secure all types of properties including residential homes and businesses from commercial and industrial to metropolitan & county councils, NHS trusts, police authorities and blue chip companies.

City Security Services provides a customer focused professional security service in London and the Home Counties. Their proactive approach ensures that you receive a bespoke personal service which is specifically tailored to meet every aspect of your corporate security requirements.

CityFibre builds transformational fibre optic infrastructure for the UK. CityFibre is thelargest provider of fibre infrastructure to the UK’s second tier citie

CitySync was formed in the late 1990s specifically to develop innovative technology solutions in the field ANPR / LPR. CitySync automatic number plate recognition (ANPR) family is a part of ISS’ industry leading computer-enabled detection (CED) products.

CIVIC Security supplies, installs and maintains a complete range of security, communications and electrical services. The UK based company provides CCTV, access control, fire alarms and intruder alarms to residential, commercial and industrial sectors, including local authority housing, housing associations and government departments.

The Civil Nuclear Constabulary (CNC) is an armed police force, keeping the nation safe from harm by securing the integrity of civil nuclear material. The CNC's primary function is the protection of licenced nuclear sites. The civil nuclear industry includes nuclear research and provides nuclear energy to millions of people. The CNC provides security structure which defends the nation.

CLA is a professional services consultancy that provides high level advice and support to a wide range of government, corporate and private clients. Founded in 2005, CLA comprises a core team of professionals highly experienced in delivering infrastructure, physical. personal and reputation security supported by an international network of specialist consultants and partner organisations

Clantect delivers products and services capable of solving and overcoming major challenges and threats in the security, defence and maritime industries, in the UK and throughout Europe. Their motion detection systems is a key component in the prevention of the illegal cross-border entry of people, by detecting hidden human presence in heavy goods vehicles.

Claranet are experts in modernising and running critical applications and infrastructure. One of only five companies to have all three audited Managed Service Provider certifications from the hyperscalers Microsoft Azure Expert MSP and Gold Partner, AWS Premier Consulting Partner and Google Cloud Premier Partner.

Clarion Security Systems Ltd is a security company in Manchester and are dedicated to the design, installation, service and maintenance of CCTV, Access Control, Intruder Alarms, Intercom, Visitor Management and Integrated Security Systems for commercial enterprises.

Clarion Security Systems is a security company dedicated to the design, installation, service and maintenance of CCTV, access control, intruder alarms, intercom, visitor management and integrated security systems for commercial enterprises.

Clarke Instruments Ltd, is a U.K. family company that was established in 1969. The company specialises in the supply, installation and maintenance of security and access control systems and benefits from a range of own designed and manufactured electro-mechanical products such as turnstiles, vehicle barriers, gatedrives, gatelocks, electric strikes and solenoid bolts.

Class A Alarms is a security company providing CCTV, access control and intruder alarm systems to businesses and home owners across the East Midlands. Class A Alarms is NACOSS Gold and BS EN ISO 9001 accredited.

The UK’s Classic Security Solutions Ltd specialises in design, installation and maintenance of all types of electronic security systems. The company provides CCTV systems, access control, intruder alarms, fire alarm, security monitoring and smoke clock etc. for councils, government offices, premiership football clubs, power stations, schools, retail chains, hospitals, and individual homes.

Classwatch supplies mobile video systems and fixed video systems for the UK education sector. Classwatch is an audiovisual recording system that allows teachers and students to learn from and share their classroom activities.

CLD is the UK’s leading manufacturer of welded steel rigid wire mesh fencing. The company's product portfolio includes steel security fencing, sports fencing and access solutions.

Clear Image (CCTV Systems) Ltd is a security solutions provider in the UK. The company provides IP CCTV surveillance, access control, lone worker solution, monitoring systems and maintenance services to universities, clinics, and commercial etc.