
WHO WE ARE
About Si4
Si4 is a specialist physical security consultancy, based in Cardiff, UK.
Our purpose is what drives us. We exist to enable organisations to realise their strategic ambitions, by providing specialised physical security and risk management services that identify, assess and mitigate risks to their strategic success.
Together, we curate safe, secure and resilient organisations in an age of ever-changing risk.
Customer Feedback
Paul Davies CPP PSP
Director | Principal Consultant
Paul is a highly experienced physical security and resilience consultant, advisor and project manager. Paul has more than two decades of experience in strategic and operational leadership of physical security, risk and resilience, working with, or within, some of the largest and well-known organisations in world.
As an Si4 Consultant, Paul is passionate about leading transformational change programmes in the domains of physical security, risk management and resilience, and working with organisational leadership to identify and mitigate risks to their strategic ambitions.
Before founding Si4, Paul held strategic leadership positions in companies such as Amazon (UK Head of Security & Loss Prevention) and Selfridges (Director of Physical Security & Loss Prevention), championing innovation and operational excellence.


OUR MISSION
At Si4, our mission is to empower organisations with resilient security strategies that enable them to thrive in a turbulent world. We are committed to providing unparalleled expertise to safeguard our clients' critical assets.
We believe in fostering strong partnerships with our clients, understanding their unique security challenges, and delivering tailored solutions that address their specific needs.
CORE VALUES:
Excellence
We are driven by a relentless pursuit of excellence, ensuring that our team stays at the forefront of advancements in physical security to offer the best-in-class solutions to our clients.
Integrity
Integrity is at the core of everything we do. We uphold the highest ethical standards, ensuring transparency and trust in all our client engagements.
Innovation
We embrace innovation and continuously review and assess industry best practices, new technologies, standards and governances, to stay agile in the face of an evolving threat landscape.
Question: How many Clients returned to Si4 after the first engagement?
Answer: 100%