The United Kingdom (UK) is facing its first-ever ISDS claim. In August 2025, Singapore-based Woodhouse Investment Pte Ltd and its UK subsidiary West Cumbria Mining (Holdings) Ltd filed an ICSID claim against the UK based on the UK-Singapore BIT (1975). The claimants maintain that the UK unlawfully deprived them of their coal mine investment after an English High Court revoking approval for a new coal mine in Cumbria due to its climate impacts. This claim highlights the continuing tension between climate action and investor protection and could shape how governments try to strike a balance between both interests. The case illustrates how climate action, particularly restrictions on fossil fuel projects, can trigger costly disputes under investment treaties. Indeed, the proceedings could cost the UK government a significant amount of public money, underscoring the financial risks states face when climate policies intersect with investor rights.