Diama Security, Your Trusted Security Partner
At Diama Security, we are dedicated to safeguarding what matters most, your assets, property, and people. With extensive industry expertise, our team of highly trained professionals provides tailored security solutions designed to meet the unique needs of businesses and individuals.
Our comprehensive services include manned guarding, mobile patrols, CCTV monitoring, and event security, with a specialised focus on crowd management, behavioral detection, and emergency preparedness for major incidents. Our security personnel are well-versed in the Protection of Premises Bill, ensuring compliance and robust security measures for all environments.
By integrating cutting-edge technology and industry best practices, we deliver reliable, proactive protection that prioritises safety, vigilance, and operational excellence.
Based in Canary Wharf, London, Diama Security is committed to setting the standard in security services, offering peace of mind through expertise, innovation, and unwavering professionalism.
“Your safety is our priority”
Core Values
Our core values define our commitment to excellence. We uphold the highest standards of integrity, ensuring honesty and ethical conduct in every aspect of our operations. Professionalism is at the heart of what we do, delivering reliable, top-tier service that our clients can depend on. We embrace innovation, staying ahead of security advancements to provide cutting-edge solutions. With a strong customer focus, we listen, adapt, and tailor our services to exceed expectations. These values drive our decisions and actions, fostering lasting relationships and a reputation for exceptional security services.
We uphold the highest standards of honesty and ethical behavior in all our operations. Our clients trust us to act with integrity, and we are committed to maintaining that trust.
Our team of security professionals is highly trained and dedicated to providing exceptional service. We strive for excellence in every aspect of our work, from our appearance to our actions.
We understand the importance of dependable security. Our clients can count on us to be there when they need us, providing consistent and reliable protection.
We embrace the latest technologies and security practices to enhance our services. By staying at the forefront of industry advancements.
Our clients' safety and satisfaction are our top priorities. We listen to their needs, tailor our services accordingly, and aim to exceed their expectations.
We prioritised collaboration, working closely as a team and with our clients to ensure seamless communication and efficient security operations.
Barney Barnett
MANAGING DIRECTOR
Barney Barnett is a highly accomplished Managing Director in the security sector, recognised for his strategic leadership and expertise in security operations, executive protection, behavioural detection, and large-scale crowd management.
He has a proven track record in designing and delivering robust security frameworks, specialising in risk mitigation, operational planning, protective intelligence, and threat assessment. His use of behavioural detection techniques enhances his ability to identify and disrupt potential threats in dynamic environments.
Barnett has led executive protection operations for royalty, VIPs, politicians, and senior global figures across corporate, government, and international settings. He has also directed security strategies for major events, working closely with law enforcement and intelligence partners to deliver compliant, intelligence-led solutions.
Known for building high-performing teams and strong client relationships, Barnett drives operational excellence through integrity, innovation, and a proactive approach to risk, consistently delivering in complex and high-pressure environments.
Callum Chesters
SECURITY OPS MANAGER
Callum brings over a decade of experience from the British military, having served for 10 years on deployments across multiple regions worldwide. His background has equipped him with strong leadership, operational planning, and decision-making skills in high-pressure environments.
Following his military career, Callum has built extensive experience across the security sector, ranging from frontline roles on the doors to working in Ultra High Net Worth (UHNW) protection and Residential Security Teams (RST). He has also provided close protection for A-list celebrities, operating in dynamic and high-profile environments where discretion and professionalism are critical.
His diverse background gives him a well-rounded understanding of both operational delivery and client-focused security. Callum is committed to maintaining the highest standards of professionalism, discretion, and reliability, ensuring every operation is delivered with precision and integrity.
Nick Lewis
SECURITY OPS MANAGER
Nick Lewis is a seasoned Security Operations Manager with over 20 years of experience in high-threat and Ultra-High-Net-Worth (UHNW) environments. Known for his expertise in tactical security, risk assessment, and operational leadership, he has led numerous large- scale security operations across the Middle East, providing protection for high-profile
individuals and ensuring the highest level of safety in volatile environments.
Highly skilled in operational planning, team management, and executing complex security strategies, Nick has completed advanced training and certifications that enhance his ability
to provide tailored protection and ensure confidentiality in all aspects of his work.
A results-driven professional, Nick excels in identifying potential threats and mitigating risk, consistently operating with a focus on safety, precision, and the well-being of clients and personnel. His commitment to excellence, combined with his attention to detail, allows him to deliver top-tier security operations in even the most demanding and high-pressure
environments.
Billy Delaney
LEAD INSTRUCTOR
Billy Delaney is an experienced security and training professional with 15 years in the security and safety industry. His career has progressed from door supervision into close protection, then into senior management and training leadership roles, giving him a unique understanding of the industry at every level.
As a close protection licensed professional, Billy has worked in frontline operations, crowd safety management, high-risk environments, and leadership positions where professionalism, adaptability, and sound decision-making are essential.
His experience includes major UK events, large-scale public-facing venues, and overseas assignments in places such as Saudi Arabia. This hands-on background allows him to deliver training built on genuine operational experience and real-world credibility.
Billy specialises in practical, engaging, and scenario-based training designed to build confidence, competence, and professionalism in individuals and teams.
He delivers accredited and bespoke training in physical intervention, conflict management, first aid, mental health first aid, crowd safety, close protection, and specialist operational programmes.
His mission is to develop capable, resilient people and teams who are prepared to perform when it matters most.