Philipp Kurek discusses the UK’s first-ever ICSID claim in PLC Magazine

A significant claim was registered on 8 August 2025 at the International Centre for Settlement of Investment Disputes (ICSID). Woodhouse Investment Pte Ltd and West Cumbria Mining (Holdings) Ltd v. United Kingdom (Case No. ARB/25/37) [1] is the first arbitration against the UK to be brought under the ICSID Convention. While the UK has previously faced other investment treaty claims outside ICSID,[2] this filing marks a milestone in the UK’s engagement with investment treaty arbitration.

The case arises under the 1975 UK–Singapore Bilateral Investment Treaty (BIT) and stems from the Woodhouse Colliery project – a proposed deep coking coal mine near Whitehaven in Cumbria. Planning permission was granted in December 2022 by the then Secretary of State for Levelling Up, Housing and Communities, Michael Gove. That approval was quashed by the High Court in September 2024 for legal error, and West Cumbria Mining subsequently withdrew its application in April 2025.

West Cumbria Mining and its Singaporean parent company, Woodhouse Investment Pte Ltd, are now suing the UK government for compensation relating to the quashed project. Although the precise claims have not been made public, they are likely to allege breaches of treaty standards such as fair and equitable treatment and protection against indirect expropriation.

Beyond the particulars of the Woodhouse dispute, the case illustrates a wider pattern. Investor–state arbitration under bilateral and multilateral treaties is no longer confined to emerging markets: politically sensitive regulatory measures taken by mature, rule-of-law jurisdictions are increasingly being tested before international tribunals. Against that backdrop, the UK’s first ICSID case is less an isolated watershed than the latest instance of a wider shift in which developed states are regularly named as respondents.

Background to the Dispute

The Woodhouse Colliery project, also known as Whitehaven coal mine, was a proposed coking coal mine near Whitehaven, which would have been Britain’s first new deep coal mine for more than 30 years. It was projected that the mine would produce up to three million tonnes of coking coal annually, with operations envisaged until 2049.

Proposed by West Cumbria Mining, reportedly 80%-owned by Singapore-based Woodhouse Investment Pte Ltd, with press reports linking the ultimate parent to private equity firm EMR Capital, the Woodhouse Colliery project was designed to supply metallurgical coal for use in steelmaking. A planning application for the mine was under consideration for several years before Cumbria County Council initially granted planning permission in 2019.

As the UK’s first new deep coal mine for several decades, the Woodhouse Colliery project was controversial from the outset. Notwithstanding its promised economic benefits, including the creation of jobs in the area, it polarised opinion, with opponents citing its significant projected CO2 emissions.

After several years of further consultation, final approval was eventually granted by the UK government in 2022, only to be quashed by the High Court two years later in Friends of the Earth Ltd. v. Secretary of State for Levelling Up, Housing and Communities,[3]. The High Court overturned the approval, citing a “legally flawed” assumption by the UK government that the mine would not increase greenhouse gas emissions. In April 2025, West Cumbria Mining withdrew its planning application.

Investors then commenced arbitration under the UK-Singapore BIT in August 2025. Although details of the claim have not been publicly disclosed, it is generally understood that the claims relate to the Woodhouse Colliery project and likely raise standard treaty protections, including fair and equitable treatment and protection against indirect expropriation.

While this is the UK’s first ICSID case, it is consistent with developments elsewhere, with other advanced economies, including EU member states and the United States, frequently named as respondents in recent years.

Claims against Developed States

The UK’s first ICSID case is symbolically significant, but it does not stand in isolation. Over the past decade, an increasing number of treaty claims have been brought against developed democracies – most notably in the energy sector. Prominent among them are Italy, the Netherlands, and Spain, which have faced a diverse range of claims under the Energy Charter Treaty 1994 (ECT) that arose from fundamental shifts in renewable energy subsidies and climate-related policies.

A lack of consensus on how to modernise the ECT, combined with the treaty’s continued protection of fossil fuel investments, has led several states to move towards withdrawal. The UK’s withdrawal from the ECT took effect on 27 April 2025, with the EU and Euratom following on 28 June 2025. Several individual EU member states have also withdrawn or announced their intention to withdraw.

Germany and the United States have also been respondents in high-profile energy disputes. In Vattenfall v. Germany, investors challenged the government’s decision to phase out nuclear energy; the case was ultimately settled in 2021. In TC Energy v. United States, arising from the cancellation of the Keystone XL pipeline, the tribunal dismissed the claim in July 2024.

These cases show that investment arbitration is no longer confined to developing or high-risk jurisdictions. Investors are willing to challenge measures in advanced economies when policy shifts disrupt expectations. The Woodhouse claim forms part of this pattern, underlining that even mature rule-of-law states are not immune from the constraints of their treaty commitments.

Investor Rights in Sensitive Sectors

The Woodhouse claim sits directly at the acute intersection between energy transition and investment protection. In politically sensitive sectors such as energy, projects – from fossil fuels to renewables – can be subject to rapid policy shifts: an approval granted one day may be withdrawn the next, whether by legislative, executive, or judicial action.

Such volatility creates significant legal and commercial risk for international investors. In sectors that are particularly subject to intense public scrutiny, governments may come under strong pressure to overturn their earlier decisions, especially when environmental, human rights, or social policy concerns gain widespread political traction.

The turning point in this case came not from a policy change, but from a High Court judgment that reconsidered the project’s compliance with the UK’s climate commitments. For investors in the proposed mine, that judicial finding effectively ended the project.

For international investors, the broader lesson is that even in jurisdictions which have a strong rule-of-law, their decisions to invest in policy-sensitive sectors must take account of potential policy reversals that may be sudden and significant. Although their engagement and pragmatic alignment with policy objectives may help to reduce points of potential friction, effective treaty planning remains the ultimate safeguard.

Treaty Protection as a Safeguard

Beyond domestic legal protections, bilateral and multilateral investment treaties provide foreign investors with an additional layer of protection.

Such treaties typically commit the host state to additional standards, including fair and equitable treatment, protection from unlawful expropriation, and non-discrimination. If those standards are breached, they also allow qualifying investors to bring claims before international tribunals.

Critically, they provide a neutral forum and deliver an enforceable remedy: attributes that can be especially attractive when domestic avenues have been exhausted or are perceived to be ineffective.

Equally significant, arbitral awards rendered under the ICSID Convention benefit from a unique enforcement mechanism: under Article 54 of the Convention, more than 150 Contracting States across the world must recognise and enforce them as if they were final judgments of their own courts.

Procedure and Reputation

Reputational challenges that accompany investor-state arbitration are also thrown into sharp relief by the Woodhouse claim.

Against a backdrop of some large taxpayer-funded awards, a range of media outlets and non-governmental organisations frequently portray investor–state dispute settlement (ISDS) cases as being heard by secretive corporate courts. Such perceptions matter.

Although ICSID proceedings are not entirely opaque – the 2022 ICSID rules took significant steps toward creating transparency and public access – the court of public opinion is still important.

For governments, the defence of legitimate policy measures in an arbitral forum may attract criticism that would not arise if the same measures were litigated in the domestic courts. For investors, it underlines how imperative it is to anticipate political sensitivities surrounding treaty claims, particularly in the energy and natural resources sectors.

Managing Treaty Risk

The protection afforded by investment treaties can be maximised long before a potential dispute arises. Careful structuring of an investment – its corporate nationality, chain of ownership and treaty coverage – can help to determine whether investors will have subsequent legal standing in order to bring a claim. Even when the host state provides a mature legal system, the Woodhouse case illustrates that careful planning at the outset can make the difference between a treaty claim being viable, or not.

In practical terms, investors should consider doing as follows:

• Structuring with purpose

Ensure that the relevant investment vehicle is incorporated or owned in a jurisdiction which has a favourable treaty network with the host state.

• Conducting multifaceted due diligence

Assess regulatory risks alongside political and judicial dynamics. In the energy and mining sectors, match environmental and social impact assessments against a realistic appraisal of potential changes to governmental policy or judicial interpretation.

• Drafting for clarity

Although states negotiate treaties, investors can still influence contractual arrangements with state entities with which to align and reinforce treaty protections.

• Preserving evidentiary records

Establishing legitimate expectations often depends on anticipating potential regulatory changes and keeping contemporaneous records of governmental assurances, policy statements and approvals.

In essence, treaty protection does not provide a guarantee against adverse outcomes, but it does serve as a strategic tool: when integrated into investment planning, it can materially alter the degree of risk and the options available in the event of a dispute arising.

Conclusions and Takeaways

The UK’s first appearance as a respondent in an ICSID arbitration is more than a symbolic milestone. It is a reminder that no jurisdiction is immune from investment treaty claims: when domestic policy objectives intersect with international legal obligations, disputes can be generated in stable, rules-based systems just as easily as in jurisdictions which do not share those characteristics.

The Woodhouse claim will act as a test case for the UK’s treaty commitments, the balance of competing interests between climate policy and investor protection, and the readiness to defend domestic decisions before an international tribunal.

It should prompt international investors to reconsider how treaty protections are integrated into their project planning, risk management and dispute readiness.

[1] Woodhouse Investment Pte Ltd and West Cumbria Mining (Holdings) Ltd v. United Kingdom (ICSID Case No. ARB/25/37).

[2] While the UK previously faced an UNCITRAL (non-ICSID) claim in Sancheti v. United Kingdom, that case was discontinued in 2009. In 2023, Huawei also notified the government of a potential treaty claim over its exclusion from the UK’s 5G rollout, and there have been unconfirmed reports that Russian businessman Mikhail Fridman may be preparing to challenge the freezing of his UK assets following sanctions imposed after Russia’s invasion of Ukraine.

[3] Friends of the Earth Ltd v. Secretary of State for Levelling Up, Housing and Communities ([2024] EWHC 2349 (Admin)).