The Nuclear Regulation Bill: a New(clear) Era (Part 1 – No Permission Needed)

On 13 May 2026, it was announced that a Nuclear Regulation Bill would be introduced for discussion in the next parliamentary session.¹ With the new parliamentary session almost upon us, this article explores the background to the Nuclear Regulation Bill and some of the recommendations from the Fingleton Review which are already starting to take shape, and what this could mean for stakeholders in the UK nuclear industry.

The Current State of Affairs

The UK’s nuclear regulatory regime is, as it currently stands, complex, expensive, and time-consuming to navigate. It is also frequently criticised for simply no longer being appropriate for the types of new technologies that have come on in leaps and bounds in recent years.

The announcement of a new Nuclear Regulation Bill, which seeks to consolidate, streamline and simplify the regulatory process in the UK, therefore marks a significant milestone.

The Fingleton Factor

The origins of the Nuclear Regulation Bill lie in the independent “Nuclear Regulatory Review”, commissioned in January 2025 by the Labour government and led by economist John Fingleton. Published in November 2025, the review (widely known as the “Fingleton Review”) delivered a stark assessment of the state of nuclear regulation in the United Kingdom. Its central finding was unequivocal: the existing regulatory framework had made the UK “the most expensive place in the world to build nuclear projects.”²

The Fingleton Review identified five primary regulatory problems contributing to the high costs and persistent delays afflicting UK nuclear construction. The review attributed these problems to five underlying features of the regime:³

1. “Fragmented Oversight”: oversight was divided among as many as eight regulators on a single defence project;
2. “Disproportionate Decisions”: regulatory judgments were not sufficiently proportionate to the relationship between risk and benefit;
3. “Flawed Legislation”: legislation rewarded procedural compliance rather than outcomes;
4. “Government Indecision”: the Government had failed to settle important policy issues; and
5. “Weak Industry Incentives”: neither regulators nor industry faced strong enough incentives to improve efficiency.

The review concluded that together these factors had cultivated a “deeply ingrained culture of complacency and extreme risk aversion” across the sector.

The review proposed 47 recommendations for reform, spanning structural changes to regulatory bodies, revisions to the tolerability of risk framework, reforms to planning and siting policy, and measures to strengthen accountability and incentive alignment.

The Government’s Response

On 13 March 2026, the Government published “Building Our Nuclear Nation”, its formal response to the Fingleton Review.⁴ The response accepted all 47 recommendations in principle and committed to their implementation by the end of 2027, subject to legislative timelines. The document also set out two overarching objectives: first, to restore momentum to Britain’s nuclear industry by applying decisions that are proportionate to risk; and second, to simplify the planning and environmental assessment regime so that avoidable obstacles to new nuclear projects are removed.

A number of the reforms set out in “Building Our Nuclear Nation” do not require primary legislation and have already been initiated:

• Recommendation 3 – ONR as Lead Regulator: From 31 March 2026, the Office for Nuclear Regulation (“ONR”) has been designated as the lead regulator for significant multi-regulator nuclear projects. A Lead Nuclear Regulator Group (“LNRG”) has been established to coordinate regulatory engagement across projects and to give project developers one designated channel for regulatory engagement.⁵ This interim arrangement is intended to address the fragmentation identified in the Fingleton Review whilst the longer-term statutory framework is put in place.
• Recommendation 4 – ONR and DNSR Merger: The Government has announced that ONR and the Defence Nuclear Safety Regulator will be merged to create a single nuclear safety regulator covering both civil and defence programmes. Initial organisational changes are expected during Autumn 2026, with full completion of the merger targeted by the end of 2028.⁶ The merger is intended to eliminate duplication, improve the sharing of technical expertise across the civil and defence sectors.
• Recommendation 6 – Expert Advisory Panel on Tolerability of Risk: An independent expert advisory panel has been set up to examine the nuclear sector’s application of the Health and Safety Executive’s (“HSE’s”) Tolerability of Risk Framework. The panel was due to conclude its findings by June 2026, with such findings to feed directly into the ONR’s review of its Safety Assessment Principles, which are due to be updated in December 2026._⁷
• Recommendation 47 – Nuclear Regulatory Implementation Panel: The Nuclear Regulatory Implementation Panel (“NRIP”) has been established under the chairmanship of the Department for Energy Security and Net Zero (“DESNZ”) to oversee the implementation of the reform programme.⁸ NRIP will serve as the principal coordinating body for tracking progress against the reform commitments and will play a central role in managing the transition to the new regulatory framework.

Conclusion

The advancement of nuclear projects, worldwide, is frequently discussed in terms of ‘what must come first? The chicken, or the egg?’. Commentators have long asserted that developers are hesitant to commit to nuclear projects and fund the associated infrastructure if they do not have the certainty of local government support and regulatory clarity. Meanwhile, governments can be reluctant to commit support until they have greater certainty of the success of such projects, including seeing the infrastructure in place, operable and reliable. It is hoped that the Nuclear Regulation Bill and the implementation of the Fingleton Review’s recommendations will recognise this, and will smooth the way for nuclear projects at least in the UK.

¹https://www.gov.uk/government/speeches/the-kings-speech-2026.

²https://assets.publishing.service.gov.uk/media/692080f75c394e481336ab89/nuclear-regulatory-review-2025.pdf, page 6.

³https://assets.publishing.service.gov.uk/media/692080f75c394e481336ab89/nuclear-regulatory-review-2025.pdf, page 6–8.

⁴https://www.gov.uk/government/publications/building-our-nuclear-nation-government-response-to-the-nuclear-regulatory-review-2025/building-our-nuclear-nation-government-response-to-the-nuclear-regulatory-review-2025-accessible-webpage.

⁵https://www.onr.org.uk/news/all-news/2026/09/onr-sets-out-major-reform-programme-to-accelerate-safe-delivery-of-uks-nuclear-ambitions; https://nuclear.britishprogress.org/recommendation/3.

⁶https://www.gov.uk/government/publications/building-our-nuclear-nation-government-response-to-the-nuclear-regulatory-review-2025/building-our-nuclear-nation-government-response-to-the-nuclear-regulatory-review-2025-accessible-webpage, ‘Streamlining nuclear regulatory structures’; https://nuclear.britishprogress.org/recommendation/4.

⁷https://nuclear.britishprogress.org/recommendation/6.

⁸https://nuclear.britishprogress.org/recommendation/47.

This information is provided by Vinson & Elkins LLP for educational and informational purposes only and is not intended, nor should it be construed, as legal advice.