Strengthening our national infrastructure in an evolving threat landscape
The UK's Critical National Infrastructure (CNI) is facing its most significant cyber security shift in decades, driven by a rapidly evolving threat landscape and a new wave of regulation.
The UK's Critical National Infrastructure (CNI) is facing its most significant cyber security shift in decades, driven by a rapidly evolving threat landscape and a new wave of regulation.
The Cyber Security and Resilience Bill<https://bills.parliament.uk/bills/4035> is quickly progressing through Parliament. We are also seeing the introduction of new regulations, alongside compliance with standards such as the IEC-62443.<https://www.isa.org/standards-and-publications/isa-standards/isa-iec-62443-series-of-standards> This means organisations responsible for critical infrastructure and essential digital services are facing greater accountability than ever before, along with tougher penalties and fines if they fail to protect systems that are breached.
The systems that underpin our essential services are under unprecedented pressure due to the evolving risk environment and Geopolitical instability - every day we see increasingly sophisticated cyber activity from both state and non-state actors.
The consequences of a successful attack reach well beyond IT. Disruption to critical infrastructure can impact public services, economic stability and, ultimately, national resilience. For operators of essential services (OESs) within the UK's CNI, the focus has now shifted on how to implement cyber security measures effectively across all interconnected environments where operational technology (OT), information technology (IT) and Internet of Things (IoT) devices work side by side.
As this type of digital transformation accelerates across mission critical sectors - including energy, water, transport and communications - OESs must balance this modernisation with resilience to ensure that new connectivity solutions enhance operational performance without inadvertently introducing new risks and vulnerabilities.
Legacy meets transformation
The greatest challenge facing the CNI sector today is managing out-of-date infrastructure while safely embracing modern digital platforms.
Many critical systems were designed at a time when industrial environments were largely isolated from external networks. Security considerations were often focused on physical access and reliability rather than cyber threats.
That landscape has changed dramatically. Legacy operational systems are increasingly being connected to enterprise IT, cloud platforms, and remote management technologies to improve efficiency, automation, and operational insight. While this convergence delivers significant benefits, it also introduces new security considerations.
Older technologies often lack the built-in security capability found in modern digital architectures. Integrating them with newer technologies can create blind spots, fragmented security policies, and complex hybrid environments that make monitoring and risk management considerably more difficult.
This challenge becomes greater for operators already managing extensive and geographically dispersed infrastructure estates. Critical infrastructure now spans physical sites, edge devices, cloud platforms and multiple vendor technologies, all of which must remain secure while maintaining uninterrupted operations.
Convergence offers opportunity and greater risk
Digital convergence is essential for modernising infrastructure, but every new connection also creates another potential point of compromise. Cyber threats targeting CNI are increasing in sophistication, persistence and intent. State-backed groups and organised cyber criminals understand that disrupting critical infrastructure offers a high-value target with the potential to cause significant widespread impact. The National Cyber Security Centre (NCSC) has warned of a widening gap between the growing threat to critical systems and the ability of organisations to defend them.
At the same time, the interconnected nature of critical infrastructure means that incidents in one area can cascade across others. A compromise in energy infrastructure, for example, has the potential to also disrupt transport networks, telecommunications and essential public services.
Protecting individual systems is therefore only part of the solution. Organisations need a holistic approach that considers how digital infrastructure, operational processes, and supply chains interact across the wider ecosystem.
Embedding security from the outset
For many years, cyber security has often been implemented as an 'add-on' to systems after they have been designed or deployed.
But with mission-critical systems, that mindset is lacking. Instead, security needs to be embedded throughout the lifecycle of infrastructure projects, from initial planning and design through to implementation, operation, and ongoing management.
This approach considers the full operational environment by integrating physical security, cyber controls, and governance frameworks across both IT and OT systems. It also draws on proactive threat intelligence, regulatory frameworks and best-practice standards to identify and mitigate weaknesses before they develop into operational vulnerabilities.
Crucially, this approach recognises that resilience is not just about preventing attacks. It is about ensuring systems can detect, respond to and recover from incidents without compromising the delivery of essential services.
For organisations operating critical infrastructure, achieving this requires a comprehensive security strategy built around visibility, resilience, and operational continuity.
Resilience must be adaptive
As cyber threats rise, static compliance frameworks are no longer enough. Resilience must be adaptive.
Organisations need to maintain continuous visibility across their IT and OT environments, so security teams can identify abnormal activity earlier and respond quickly to emerging threats before they escalate.
Supply chains are equally critical. As infrastructure ecosystems become more interconnected, partners and vendors play an increasingly critical role in maintaining security and resilience, which is why closer collaboration with suppliers is crucial. Building trusted partnerships and adopting defence-in-depth strategies will therefore be essential for managing risk across complex infrastructure environments.
Securing infrastructure, protecting the nation
Protecting Critical National Infrastructure is about far more than safeguarding technology. It is about preserving the essential services that citizens, businesses, and the public sector depend on every day. These systems underpin the safety, stability, and prosperity of the nation.
As digital transformation grows across the UK's critical infrastructure, resilience must be designed into every system, from design and deployment through to operation and recovery.
By embracing secure-by-design principles, improving visibility across converged IT and OT environments, and focusing on resilience over minimum compliance, the UK can strengthen its infrastructure, ensuring that it is not only smarter and more connected, but also capable of withstanding the threats of an increasingly complex changing world.
Because ultimately, strengthening the resilience of our critical infrastructure will protect the resilience of the nation itself.
About Peter Clapton
Peter Clapton<https://www.linkedin.com/in/peter-clapton-04136b16/?isSelfProfile=false> is CEO and one of the founding members of Vysiion<https://www.vysiion.co.uk/>, now trading as part of the Exponential-e Group.<https://www.exponential-e.com/>
He has played a strategic role in helping to build the business into a high calibre technical solution and services business, delivering 'secure by design' solutions for CNI customers, both in the UK and overseas. This has been recognised with sales growth coming from the supply of critical network infrastructure, platforms, and support services to customers within the renewable energy, defence, transport, and industrial sectors.
Anna Hennessy
Head of division
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