3.1.2.5 - The European Union and UK Politics
This lesson stays inside AQA 3.1.2.5. It teaches EU institutions, the aims of the EU, and the EU's impact on UK politics and policy making, with Brexit used only where it explains that impact.
Aims and institutions
It is not just an international organisation where governments occasionally cooperate; in many policy areas it can create laws, coordinate policy and enforce obligations through shared institutions.
European Union
A political and legal union of European states that can create laws, coordinate policy and enforce obligations through shared institutions.
The EU's main aims can be grouped into five ideas:
| Aim | What it means in practice | AQA evaluation angle |
|---|---|---|
| Peace and values | Preventing war between member states and promoting democracy, rule of law and rights | Strong historical success inside the EU, but rule-of-law disputes show that shared values can be contested |
| Internal market | Free movement of goods, services, capital and people inside the EU | Deep economic integration, but it requires common rules that can limit national policy freedom |
| Freedom, security and justice | Cooperation on borders, asylum, policing and crime | Useful for cross-border problems, but sensitive because it touches immigration and legal sovereignty |
| Sustainable growth and social progress | Economic development, employment, environmental protection and consumer standards | EU policy can raise common standards, but critics argue it adds regulatory burdens |
| External influence | Promoting EU interests and values in the wider world | The EU is stronger collectively in trade and diplomacy, but foreign policy often depends on member-state agreement |
The key AQA term is "EU institutions". Institutions matter because they show how EU power is shared between member-state governments and supranational bodies.
| Institution | Main role | Why it matters for UK politics |
|---|---|---|
| European Commission | Proposes EU laws, manages EU programmes and helps enforce EU law | During membership, UK policy was affected by Commission proposals and enforcement; after Brexit, UK influence over proposals is external |
| European Parliament | Directly elected EU law-making body; shares legislative and budget power in many areas | UK citizens elected MEPs before Brexit; leaving removed this direct representation |
| Council of the European Union | National ministers amend and adopt laws and coordinate policy | During membership, UK ministers had a vote in many policy areas |
| European Council | Heads of government set the EU's broad political direction | UK prime ministers used this arena to negotiate opt-outs, reforms and Brexit terms |
| Court of Justice of the EU (CJEU) | Interprets and enforces EU law consistently | Central to debates about sovereignty because EU law could override conflicting domestic law while the UK was a member |
| European Central Bank | Sets monetary policy for the euro area | The UK never joined the euro, showing that EU integration has varied levels |
| European Court of Auditors | Audits EU finances | Supports accountability for EU spending |
Two vocabulary distinctions help avoid vague answers.
Supranational
An institution can exercise authority above individual states in agreed areas.
Intergovernmental
Governments bargain and decide together, preserving a more direct role for national executives.
The UK-EU relationship
The UK's relationship with the EU has moved through three broad phases.
| Phase | Relationship | Political significance |
|---|---|---|
| Membership, 1973-2020 | The UK was inside EU institutions, the single market and the EU legal order, while retaining opt-outs such as the euro and Schengen | UK governments accepted shared rule-making in return for influence and market access |
| Exit and transition, 2020 | The UK left the EU on 31 January 2020. The transition ended on 31 December 2020, when the UK left the single market and customs union | The UK became legally separate, but had to negotiate replacement arrangements quickly |
| Post-Brexit relationship, 2021-present | The UK is a third country linked to the EU through the Withdrawal Agreement, the Windsor Framework and the Trade and Cooperation Agreement (TCA) | UK-EU politics now works through treaties, committees and diplomacy rather than UK membership of EU institutions |
The TCA is the main post-Brexit framework. It gives tariff-free and quota-free goods trade where rules of origin are met, but it is much thinner than EU membership. The UK is outside the single market and customs union, so businesses face more border, regulatory and paperwork barriers than under membership. Services, including financial services, have less automatic access than they did before.
The TCA also created a governance system: a Partnership Council, specialist committees and dispute procedures. This matters because policy conflict did not disappear after Brexit. It moved from internal EU law-making to international treaty management.
Northern Ireland is a special case. The Windsor Framework, agreed in 2023, modified the earlier Northern Ireland Protocol. Its central purpose is to avoid a hard border on the island of Ireland while protecting the EU single market. That means Northern Ireland continues to follow specified EU rules for goods, even though the rest of the UK is outside the EU single market. In December 2024, the Northern Ireland Assembly consented by simple majority to continuing Articles 5-10 of the Framework, but unionist MLAs voted against, so an independent review was required.
UK-EU relations entered a reset phase in 2025. The 2025 UK-EU summit produced a Common Understanding covering security and defence, youth mobility, Erasmus+, energy, emissions trading, food and plant health standards, law enforcement and migration cooperation. The UK and EU have finalised UK participation in Erasmus+ from 2027. The April 2026 Erasmus+ agreement is a concrete example of renewed negotiated cooperation.
Sovereignty and law
Sovereignty means ultimate authority. In UK politics, students should separate legal sovereignty from practical sovereignty.
Legal sovereignty
The formal power to make and unmake law.
Parliamentary sovereignty means Parliament is the highest legal authority in the UK constitution.
Practical sovereignty
The real-world ability to make choices without unacceptable costs or pressures.
EU membership qualified parliamentary sovereignty in practice because EU law had domestic effect through the European Communities Act 1972. If UK law conflicted with directly effective EU law, courts could give priority to EU law. The Factortame litigation became the classic example: parts of a UK Act were disapplied because they conflicted with EU law. Supporters saw this as a necessary condition of common rules; critics saw it as a loss of control.
However, the UK was not simply powerless inside the EU. UK ministers sat in the Council of the EU, UK prime ministers sat in the European Council, UK citizens elected MEPs, and UK governments helped shape EU policy. A strong answer therefore avoids saying "the EU controlled Britain" without qualification. It was shared sovereignty: the UK accepted legal constraints in return for collective influence and market access.
Brexit changed the legal position. The UK repealed the European Communities Act 1972 and ended the general membership-based supremacy of EU law. The European Union (Withdrawal) Act 2018 preserved much EU-derived law for continuity, and the Retained EU Law (Revocation and Reform) Act 2023 later turned remaining retained EU law into "assimilated law" from 2024 and removed retained EU law's special supremacy. This does not remove the distinct legal effect of separation-agreement law: specified EU law still has effect through the Withdrawal Agreement and Windsor Framework under sections 7A and 7B of the 2018 Act.
This restored more formal legal autonomy, but it did not remove all constraints. The UK still chooses policy in a world of treaties, markets and devolution. If the UK wants easier trade with the EU, it may align with EU rules. If it diverges sharply, it may face new checks, costs or disputes. In Northern Ireland, specified EU goods rules continue because of the Windsor Framework.
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