Brexit Implications on Territorial Governance in the United Kingdom

Brexit has fundamentally altered the constitutional architecture of the UK by removing the external framework provided by the EU and thrusting long-standing territorial tensions into sharper relief. The withdrawal has reshaped the division of competencies between Westminster and the devolved administrations, compelling a renegotiation of regulatory and legislative powers in areas such as agriculture, fisheries and environmental policy. Northern Ireland’s unique status under the Protocol has introduced a regulatory border in the Irish Sea, challenging the integrity of the internal market and intensifying debates over sovereignty. In Scotland and Wales, governments have mobilised notions of differentiated engagement to protect regional interests, yet find themselves constrained by the centralising tendencies of the UK Government. These developments carry global significance as they offer a case study in how multi-level polities adapt to disintegration, informing comparative analyses of federal and quasi-federal systems. Practically, the evolving settlement influences trade negotiations, regulatory alignment and citizen engagement across the constituent nations.

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Technical terms

Devolution: Statutory delegation of powers from the central government to distinct regional administrations.

De‐Europeanisation: The process of dismantling or repatriating policies and norms formerly derived from EU membership.

Plurinational union: A polity wherein multiple national identities coexist under a single sovereign framework.

Unitary state: A governance model in which ultimate authority resides with the central government, with any regional bodies operating solely by its permission.

Regulatory divergence: The adoption of differing legal and policy standards by constituent territories following Brexit.

References

1. The Dynamics of De‐Europeanisation in a Multilevel Context: Resistance and Power Politics in Scotland and Wales. JCMS Journal of Common Market Studies (2025).
2. Taking back control? Brexit and the territorial constitution of the United Kingdom. Journal of European Public Policy (2021).
3. When Planets Collide: The British Conservative Party and the Discordant Goals of Delivering Brexit and Preserving the Domestic Union, 2016–2019. Political Studies (2020).