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First Security

UK security services - First Security


First Security UK security services

0203 267 1200

First Security, powered by Interserve, has been putting our clients’ security at the heart of everything we do for over 25 years. As a result, we are now one of the UK’s top ten security suppliers of manned guarding and total security. Our collaborative, adaptive, and future focused approach makes us the natural choice in security.

Our focus is on providing our clients with smarter security solutions, tailored to their individual requirements and delivered with unrivalled care and consideration.

From strategic future-proof planning, to providing best in class Security Officers, we serve and protect retail stores, leading banks, investment houses, distribution and data centres, retail and business parks, leading exhibition, arts and cultural centres, as well as the professional services sector.

With support of Interserve's considerable resources and its transformative commitment to sustainability and ingenuity at work, we offer an individual focus with a collective strength that offers greater benefits to our customers every day.

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Why First Security?

We understand that the service we provide to our customers must reflect changing and varied needs. We provide a tailored, future-proof solution rather than a generic response. Powered by Interserve, our range and depth of experience across the commercial world has provided us with the insights to look beyond today and the everyday to develop solutions based on our customers' environment, brand, business performance and reputation.



From manned guarding and close protection through to electronic security and resilience testing, we deliver intelligent security services that are keeping our customers' brand, people and reputation protected.

Our national control room maintains a 24/7 information feed between our clients, management and security officers ensuring a fast and correct response.

Our electronic security solutions constantly evolve to accompany and enhance more traditional manned security solutions, such as CCTV, anti-theft taggin...

A flexible and tailored approach for events, from crowd control, door supervision and VIP security to close protection and emergency response.

We protect the confidentiality, integrity and availability of our customers' data through our bespoke information security solutions

We provide 24/7 alarm response 365 days a year, responding to incidents, removing the risk and inconvenience from our clients.

Our trained security officers provide a physical presence day and night to deter crime and mitigate risk.

A thorough and professional pre-employment service offering customers correct and relevant information to support them in making the most suitable recru...

Empowering our clients through facilitation and understanding to meet regulations and gaining confidence to deal with difficult and confrontational situ...

From reception, concierge and visitor management to mobile patrols, loss prevention support and pre-employment vetting.

From close protection to penetration testing and community support officers, we have the specialist skills and expertise required

The best security starts with the best people

Visit Interserve's Careers centre to find out what available roles will suit you,
or call us on 0333 207 4211.


Safeguarding any environment

Recognising key differences, adapting to provide intelligent security solutions in any environment.

Corporate environments

Securing anything that threatens the position of a commercial business, utilising front of house staff, access control and asset protection.

Retail environments

Understanding the importance of brand image, we provide security officers where a visible presence is required and alternative covert methods where more...

Professional services

From front of house staff, to counter terror and surveillance tactics, our provision of security to the professionals services sector is well established.


Industry recognition

Recognised qualifications, awards and accreditations not only display our ability to provide intelligent security solutions, they also empower our customers with the knowledge that their security is in safe hands.

Security Industry Authority Approved Contractor Scheme

Security Industry Authority

Interserve Security (First) Limited holds SIA Approved Contractor Scheme (ACS) status for the provision of Security Guarding, Door Supervision, CCTV, Close Protection, Key Holding services.


safe contractor approved

Safe Contractor

Knightsbridge Guarding is Safe Contractor accredited following a review and audit of its health and safety policies, procedures and documentation.

Contractors health & safety assessment scheme

CONTRACTORs health & safety assessment scheme


Accredited by CHAS, Knightsbridge Guarding is a health and safety compliant accredited supplier.


Institution of Occupational Health and Safety


Knightsbridge Guarding is a member of IOSH, and delivers all of its security training courses to IOSH standards, by IOSH certified trainers.

Skills for security

Skills for Security recognised

Skills for Security

Knightsbridge's industry leading training academy is recognised by Skills for Security as an industry leader for its security training courses.



United Kingdom Accreditation Service

Knightsbridge Guarding is the first security company in the UK to achieve ISO 27001 information security management accreditation. This means we have we have robust systems in place to protect your data, and includes all aspects of IT governance, information handling, data protection and privacy related management work.



The British Standards Institution

Knightsbridge Guarding has been accredited under ISO9001 to show its continual monitoring and management of quality across all operations.

BSI ISO14001

The British Standards Institution

Knightsbridge Guarding is the first security company in the UK to achieve ISO 27001 information security management accreditation. This means we have we have robust systems in place to protect your data, and includes all aspects of IT governance, information handling, data protection and privacy related management work.

BSI ISO18001

ISO:18001 OHSAS 

The British Standards Institution

Knightsbridge Guarding is accredited for its occupational health and safety management systems.


NOCN member


Knightsbridge Guarding is a member of NOCN, and delivers industry leading security training courses recognised and supported by NOCN.

Institute of conflict management

ICM member

The Institute of Conflict Management

Knightsbridge Guarding is a member of ICM to support its industry leading security training courses.


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