Preparing the UK’s Critical National Infrastructure
for the Cyber Security & Resilience Bill.
What does the Cyber Security & Resilience Bill mean for UK CNI? Explore the requirements, reporting changes and steps organisations can take to prepare.
Across the UK's Critical National Infrastructure (CNI), cyber security is now firmly established as a board-level priority, rather than the sole purview of IT and security teams. In response to the increasing range of cyber threats mounted by global bad actors, the Government has implemented an increasingly stringent range of standards around the security and resilience of the systems and data that power the nation's critical services, including the IEC-62443 standard, the NCSC's NIS 2018 directive, CAF V4, and, crucially - the upcoming Cyber Security & Resilience (Network and Information Systems) Bill.
The Bill updates and expands the existing NIS 2018 regulations, in order to strengthen the UK's overall cyber security posture, particularly with regards to critical services such as energy, water, healthcare, and transport. Key elements of the Bill include:
Expanded cyber security requirements, in direct response to an increasingly complex global threat landscape, where multiple high-profile attacks on CNI have already affected the availability of mission-critical services.
Expanding the range of organisations subject to these regulations. The new definition of CNI encompasses fourteen distinct verticals, including utilities, manufacturing, emergency services, data centres, finance, defence, healthcare, and Government organisations - all of whom will be required to achieve and maintain compliance with the Bill.
More stringent reporting obligations around cyber security incidents, with regard to both speed and detail.
Increased control and visibility of supply chains, mitigating the risk of bad actors gaining access to critical data and infrastructure via 'backdoor' attacks.
All of this will come with increased penalties for non-compliance, particularly in the event of a security breach, and new powers for regulators regarding investigation, information gathering, enforcement, and remediation.
The Bill was originally introduced in November 2025 and - at the time of writing, has not yet receive Royal Assent or an official implementation date. However, it has completed its Commons stage, and so is now passing through the House of Lords. With the Government's implementation plans having already been made public and unlikely to significantly change, additional guidance is expected to be issued once Royal Assent has been granted.
While we still don't know exactly when the Bill will come into force, it is important to be aware that achieving compliance is likely to take months, which means plans should be initiated at the earliest opportunity, beginning with a comprehensive assessment of all existing systems - both physical and digital - and processes, conducted by a trusted third-party.
This should form the basis of a comprehensive migration plan, not only to fulfil the immediate compliance obligations, but also to ensure best practice is properly embedded at all levels, and security systems and processes are able to adapt to future shifts in the threat landscape. The specifics of this will vary, depending on each organisation's current level of cyber maturity, but are likely to include:
Conducting regular cyber security and operational resilience assessments.
Establishing a robust cyber security ecosystem, incorporating zero-trust principles and effective identity and access management (including MFA and PIM), with a UK-based CSOC providing proactive monitoring and alerting.
Documented processes for incident response and recovery planning, subject to regular review.
Maintaining clear standards around supply chain risk management, with due diligence, continuous monitoring, and regular security assessments for all third parties.
Full governance and accountability at the boardroom level, with regular reporting on documented security KPIs and designated executive responsibilities and reporting paths.
For all there will be challenges involved in achieving compliance with the Bill, an effective CNI cyber security posture will be non-negotiable in the years ahead, and so this is the ideal time to review your existing systems and processes, phase out unsecure legacy systems, and maintain the all-important edge as increasingly sophisticated, aggressive threats emerge.
