Brexit represents one of the most significant institutional and geopolitical changes in the United Kingdom’s contemporary history. Following the 2016 referendum and the UK\'s formal departure from the European Union in January 2020, the transition period ended on 31 December 2020, fundamentally changing the legal, economic, political and social relationship between the UK and the EU. The post-Brexit relationship is primarily governed by the Withdrawal Agreement, the Windsor Framework and the Trade and Cooperation Agreement (TCA), while subsequent negotiations have sought to address practical difficulties arising from the new relationship.
This paper examines the impact of Brexit on UK–European relations through three interconnected dimensions: economic, political and social. Economically, Brexit has introduced additional trade barriers despite the absence of tariffs on qualifying goods, while the EU remains the UK\'s largest trading partner. In 2025, UK exports of goods and services to the EU were approximately £384 billion, representing 41% of total UK exports, while imports from the EU were £472 billion, representing 50% of UK imports. Politically, Brexit has altered the UK\'s position within Europe, requiring new mechanisms for cooperation in trade, security, migration, justice and foreign policy. Socially, the end of free movement has changed opportunities for UK and EU citizens to live, work and study across borders. British citizens travelling to most EU countries can still visit visa-free for short stays, but longer-term residence, employment and study are subject to national immigration rules.
The paper argues that Brexit should be understood not as the termination of UK–European interdependence but as a transformation of its institutional framework. Recent developments, including the 2025 UK–EU Strategic Partnership, indicate an effort to develop closer cooperation while maintaining the UK\'s status outside the EU, single market, customs union and free-movement system.