The UK Cyber Security and Resilience Bill (CSRB) is the biggest shake-up of UK cyber legislation in years - expanding scope, tightening reporting rules, and making resilience a legal obligation for organisations.
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The UK Cyber Security and Resilience Bill (CSRB) is one of the most significant updates to UK cyber legislation in years. With UK organisations operating in an increasingly hostile digital landscape, this bill has been introduced in response to the sharp rise in ransomware, data breaches and supply chain attacks, with the aim to raise the bar for how businesses prevent, detect and respond to cyber threats.
With more sectors under scrutiny, the CSRB signals a clear shift: cyber security is no longer just IT issue – it is a legal and operational priority. If your organisation delivers digital services or plays a role in essential operations, preparing now is non-negotiable - it’s essential.
Announced in the 2024 King’s Speech and backed by a formal policy paper in parliament in April 2025, the Cyber Security and Resilience Bill (CSRB) is the UK’s response to a rapidly evolving cyber ecosystem and the need for stronger regulatory oversight for organisations.
Rather than overhauling the current frameworks entirely, the CSRB builds upon the existing NIS Regulations (2018) – but with tougher requirements, broader scope and clearer responsibilities for both digital and essential service providers. It extends legal duties to a wider range of sectors, including managed service providers, cloud hosting platforms, software vendors, and those in critical national infrastructure supply chains. These changes reflect the government’s focus on elevating baseline cyber hygiene and strengthening national resilience.
The end goal for this legislation is to ensure that essential and digital services and maintain operational resilience, even in the face of growing and more sophisticated cyber threats. Organisations will be expected to take a more proactive stance on cyber security governance, which includes board-level accountability, risk assessments and coordinated incident response.
The CSRB will bring a much broader range of UK organisations into scope. If your business delivers digital services, supports critical infrastructure or operates within a regulated sector, it’s highly likely that you will be affected.
Organisations which fall under the Cyber Security and Resilience Bill include, but are not limited to:
Even if your organisation hasn’t previously fell into scope of other similar legislation, the broader scope of CSRB introduces new legal duties for a wide array of businesses, meaning even indirect links to critical infrastructure could bring your organisation under regulatory scrutiny for the first time.
For a more comprehensive deep dive into how the CSRB applies to your sector, including tailored breakdowns by industry, readiness checklists, and guidance on whether your organisation is in scope, visit cybersecurityandresiliencebill.com.
To address the ever-evolving threat landscape, the UK Government has overhauled existing legislation and has introduced sweeping changes which put pressure on organisations to strengthen their defences and take cyber security seriously.
Because the cost of not caring is too high.
The Cyber Security and Resilience Bill isn’t just another piece of regulation – it carries real financial, legal and reputational consequences for non-compliance.
According to The Register, organisations could face fines of up to £100,000 per day or 10% of global turn over for failing to act on urgent cyber threats, such as patching vulnerabilities in a timely manner. These fines are tied to specific security directives issued by government in response to emerging threats.
In addition to this, The National Cyber Security Centre (NCSC) will be provided with stronger powers with regulators, making it easier to investigate breaches and enforce compliance.
This isn’t just about avoiding fines. It’s about protecting your organisation’s ability to operate, serve customers, and maintain trust in a high-risk landscape.
The legislation isn’t set to come into force until late 2025, however, preparation is key. With all of these changes on the horizon, here’s how your organisation can begin getting ready now:
Firstly, identify whether your organisation falls under the new scope of the Cyber Security and Resilience Bill - especially if you're a digital service provider, MSP, or part of a critical supply chain. You should understand your obligations and which teams need to be involved.
Make sure your incident response processes are fit for purpose and aligned with the new legal reporting timelines (24 to 72 hours). This includes reviewing your escalation paths, running tabletop exercises, and assigning board-level accountability.
Under the CSRB, you’re not just responsible for your own systems. You are also legally accountable for the security of key suppliers and third parties. It’s a good time to review contracts, assess supplier risk, and ensure that basic security controls are being implemented across the chain.
At Precursor Security, we understand that navigating new legislation can be overwhelming- especially when it demands countless technical, procedural and organisational changes.
That’s why we are helping client prepare for the Cyber Security and Resilience Bill before it comes into effect.
Our team has real-world experience delivering compliance services across a range of industries. We can support you with:
You can explore all of our compliance services by clicking here.
In addition to this, we have built cybersecurityandresiliencebill.com – a dedicated resource hub to help you understand and prepare for the legislation. The site includes:
This Bill isn’t just a government tick box - it’s your opportunity to make resilience your competitive edge.
The Cyber Security and Resilience Bill (CSRB) will impact a wide range of organisations - but it’s also an opportunity to harden defences, protect your customers, and build a reputation for resilience.
By preparing early and building CSRB compliance into your wider cyber strategy, you don’t just reduce risk — you get ahead.
Cyber security is no longer just an IT concern - it’s now a legal obligation that boards and leadership teams must understand and actively manage.
Start preparing now by:
For ongoing updates, tailored guidance, and tools to support your organisation’s readiness, visit: cybersecurityandresiliencebill.com
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Choose Precursor Security for penetration testing excellence—where industry-leading expertise, CREST accreditation, and a client-focused approach converge to fortify your digital defences with precision and reliability.
We have a CREST accredited Security Operations Centre and all of our penetration testers are CREST certified.
We are accredited to the highest of standards including CREST, ISO27001, ISO9001 and Cyber Essentials Plus.
Our experts have a combined experience of over 30 years delivering security operations to sectors such as healthcare, financial services, aerospace and more.
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