UK Cyber Security & Resilience Bill: Why Your MSP's Compliance Matters

The UK Cyber Security and Resilience Bill (CSRB), introduced to Parliament in 2025 and expected to receive Royal Assent later this year, represents the most significant expansion of UK cybersecurity regulation since the original NIS Regulations in 2018. For the first time, managed service providers (MSPs) will fall directly within scope of mandatory cybersecurity requirements.

If you rely on an external IT provider — and most London businesses do — this legislation changes the nature of that relationship.

What the CSRB Changes

The bill updates and replaces the UK’s implementation of the EU NIS Directive, which was retained in UK law post-Brexit but had become outdated. The key changes relevant to businesses using managed IT services include:

MSPs Brought Into Scope

Under the current NIS Regulations, only operators of essential services (energy, water, transport, health) and relevant digital service providers (online marketplaces, search engines, cloud services) are regulated. MSPs sat outside this framework entirely.

The CSRB explicitly adds managed service providers as a regulated category. This means your IT provider will be legally required to implement appropriate cybersecurity measures and report significant incidents to the relevant authority.

Expanded Incident Reporting

The bill introduces faster and more detailed incident reporting requirements. Regulated entities — now including MSPs — must report significant incidents within 24 hours of detection, with a full report following within 72 hours. The definition of “significant” is broader than before, encompassing incidents that affect service availability, integrity, or confidentiality.

Supply Chain Accountability

Regulators will gain new powers to examine the supply chains of regulated entities. In practice, this means your MSP will need to demonstrate oversight of their own suppliers — the security tools they use, the cloud platforms they rely on, and the subcontractors who may access your data.

Stronger Enforcement

The Information Commissioner’s Office (ICO) and sector-specific regulators will receive enhanced enforcement powers, including the ability to issue compliance directions proactively rather than only after an incident has occurred.

Why This Matters Even If You Are Not Directly Regulated

You might think the CSRB only matters if your business falls within the definition of an essential or important entity. That is a mistake for two reasons.

First, the scope of what counts as an “important entity” has been broadened. Many mid-sized professional services firms, financial services businesses, and technology companies will find themselves newly in scope or serving clients who are.

Second, even if you are not directly regulated, your MSP now is. Their compliance obligations will flow through to the service they deliver to you. An MSP that cannot meet CSRB requirements is an MSP that represents regulatory risk to your business.

What to Expect from a CSRB-Ready MSP

Formal Security Governance

Your provider should operate under a documented information security management system (ISMS), ideally aligned to ISO 27001 or an equivalent framework. Cyber Essentials Plus certification should be considered a minimum baseline, not a differentiator.

Incident Response with Defined SLAs

The CSRB’s reporting timelines mean your MSP needs robust monitoring, detection, and escalation processes. Ask for their mean time to detect (MTTD) and mean time to respond (MTTR) metrics. If they do not track these, they are not operationally mature enough for the new regulatory environment.

Transparent Supply Chain

Your MSP should be able to tell you exactly which third-party tools and platforms underpin the services they deliver to you. This includes their remote monitoring and management (RMM) platform, their backup infrastructure, their security stack, and any subcontracted labour.

Contractual Commitments

The days of vague MSP contracts are ending. You should expect contracts that specify security obligations, incident notification timelines, data processing locations, audit rights, and exit provisions. If your current agreement is a two-page document with no security schedule, it needs updating.

The Timeline

The CSRB is progressing through Parliament with cross-party support. The expectation is that it will become law in mid-2026, with a transition period for newly regulated entities to achieve compliance. However, waiting for the final text is a poor strategy. The direction of travel is clear, and the requirements align closely with existing best practices that any competent MSP should already follow.

Practical Steps for Businesses

1. Ask your MSP directly whether they are preparing for CSRB compliance and what their timeline looks like.
2. Review your contract to check whether it includes security obligations, incident reporting commitments, and audit rights.
3. Assess your own exposure — are you an essential or important entity under the expanded definitions? Do you serve clients who are?
4. Document your IT supply chain, including all providers who have access to your systems or data.
5. Establish an incident response plan that accounts for the 24-hour initial reporting window.

Where Nerdster Stands

We have been tracking the CSRB since its consultation phase and have already aligned our operations to meet the anticipated requirements. Our clients receive documented security governance, contractual SLAs for incident response, and full transparency over the tools and platforms in our stack.

If you want to understand how the CSRB affects your business and whether your current IT setup is ready, get in touch for a free IT assessment. We will give you an honest evaluation with no obligation.