The Judiciary's Role

The judiciary is the branch of government that interprets and applies the law. In AQA Politics, that means more than "judges decide cases". Judges settle legal disputes between individuals, between organisations and, crucially, between the citizen and the state. When a claimant challenges a minister, local authority, police force or regulator, the court is asking whether public power has been used lawfully.

This gives the judiciary a constitutional role. A constitution sets the rules of political authority. The UK constitution is uncodified, so judges work with statutes, common law, conventions, rights legislation and constitutional principles. They do not normally ask "Is this policy wise?" The sharper legal question is "Did the person or body making the decision have the legal power to do this, and did they use that power lawfully?"

Three terms need to be kept separate.

Independence is institutional and personal. Institutionally, the courts must be sufficiently separate from government. Personally, a judge should not be threatened with dismissal, promotion pressure or political retaliation for reaching an unpopular judgment. The Constitutional Reform Act 2005 strengthened this separation by creating a UK Supreme Court outside Parliament and by reforming judicial appointments.

Impartiality is about the case itself. A judge who has a personal connection with one side, a financial interest in the issue or a stated prejudice should not sit. The appearance of fairness matters as well as actual fairness, because the authority of courts depends on public confidence.

Neutrality is the hardest idea. A judge can be neutral between political parties but still reach a decision that damages a government's policy. That does not automatically make the judge political. In R (AAA) v Secretary of State for the Home Department [2023] UKSC 42, the Supreme Court held that the Rwanda asylum policy was unlawful on the evidence before it. That was politically explosive, but the Court framed the issue as a legal question about statutory powers, human rights and non-refoulement.

For exam analysis, avoid saying "unelected judges control politics" as a shortcut. A better line is: the judiciary checks whether political actors have acted within law. That can have major political effects, but the source of judicial authority is legality, not electoral mandate.

Composition And Appointments

The UK judiciary is not one single court. It is a hierarchy of courts and tribunals, with the Supreme Court at the top for most appeal purposes. Below it sit courts such as the Court of Appeal, High Court, Crown Court, county courts, magistrates' courts and specialist tribunals. AQA's focus is the composition of the judiciary and the appointments process, because who becomes a judge affects both independence and public legitimacy.

The UK Supreme Court is a small senior appellate court. As of 2026-06-22, the Supreme Court website listed Lord Reed as President, Lord Sales as Deputy President, and ten other Justices: Lord Lloyd-Jones, Lord Briggs, Lord Hamblen, Lord Leggatt, Lord Burrows, Lord Stephens, Lady Rose, Lady Simler, Lord Doherty and Lord Snowden. Its membership matters because these judges hear the most legally important appeals, often in panels of five, seven, nine or, in exceptional constitutional cases, eleven Justices.

The Court's jurisdiction is also part of its composition story. It is the final court of appeal for civil cases across the UK and for criminal cases from England, Wales and Northern Ireland. Scottish criminal appeals do not normally go to the UK Supreme Court, but devolution and rights questions can still draw the Court into UK-wide constitutional issues.

Appointments are designed to protect independence. Supreme Court appointments are made through a process set out in the Constitutional Reform Act 2005 and the Supreme Court (Judicial Appointments) Regulations 2013. The Lord Chancellor convenes an independent selection commission. For an ordinary Justice vacancy, the commission includes the President of the Supreme Court, another senior UK judge, a member of the Judicial Appointments Commission, a member of the Judicial Appointments Board for Scotland and a member of the Northern Ireland Judicial Appointments Commission. At least two members nominated from the appointment bodies must be non-legally qualified.

The process has several stages.

The Judicial Appointments Commission is central for many judicial roles in England and Wales and some UK-wide tribunal roles. Its statutory duties include selecting solely on merit, selecting only people of good character and having regard to the need to encourage diversity. For UK Supreme Court roles, the JAC is involved but does not lead the process.

This gives students a balanced evaluation. The appointments system is far less openly political than in the United States, because judges are not elected and governments do not simply choose ideological allies. That supports independence and neutrality. However, critics can still question social and professional representativeness. Senior judges have often come from a narrow legal career route, with concerns about gender, ethnicity, education and class diversity. A judiciary can be independent from ministers but still face legitimacy questions if it does not look broadly representative of the society subject to its judgments.

For AQA, the strongest answer links appointments to constitutional effects. If appointments are merit-based and insulated from party competition, the judiciary is more likely to be trusted when it rules against government. If appointments appear socially narrow or politically contested, neutrality may be questioned even where judges are acting lawfully.

Supreme Court Power

The UK Supreme Court opened in 2009 after the Constitutional Reform Act 2005. Before that, the highest domestic court sat as the Appellate Committee of the House of Lords. The change mattered symbolically and constitutionally: the final appeal court moved out of the legislature and into a separate institution. That strengthened the visible separation of powers, even though the UK still has an incomplete separation because ministers sit in Parliament.

The Supreme Court is an appeal court. It does not choose political problems in the abstract, and it cannot usually hear a case unless a lower court has already made a relevant order. It hears appeals on arguable points of law of general public importance. That phrase is important: the Court is not a second chance for every losing party. Its job is to settle major legal questions.

The Court's influence comes from four main routes.

R (Miller) v Secretary of State for Exiting the European Union [2017] UKSC 5 is a key example. The issue was whether ministers could use the royal prerogative to trigger Article 50 and begin leaving the EU without an Act of Parliament. The Supreme Court held, by 8-3, that statutory authority was needed because triggering Article 50 would affect rights and legal arrangements created by Parliament. This limited executive power, but it also reinforced parliamentary sovereignty: ministers needed Parliament's authorisation.

R (Miller) v The Prime Minister; Cherry v Advocate General for Scotland [2019] UKSC 41 went further politically. The Court held unanimously that the Prime Minister's advice to prorogue Parliament for five weeks during the Brexit crisis was justiciable and unlawful. This had immediate political consequences because Parliament returned. But the legal reasoning was about constitutional limits: executive prerogative could not be used in a way that frustrated Parliament's ability to carry out its constitutional functions without reasonable justification.

R (UNISON) v Lord Chancellor [2017] UKSC 51 shows judicial influence over policy administration. The Court held that employment tribunal fees were unlawful because they effectively prevented access to justice. The policy had been made by the executive under statutory powers, but the Court found the power had been used unlawfully. Again, the Court did not design an alternative fees policy; it removed the unlawful barrier.

R (AAA) v Secretary of State for the Home Department [2023] UKSC 42 shows the Court's role in rights-heavy executive policy. The Supreme Court upheld the conclusion that the Rwanda policy was unlawful because there were substantial grounds for believing that asylum seekers sent to Rwanda would face a real risk of refoulement. The Court stressed that it was deciding a legal question, not choosing a side in the political debate about immigration. The judgment still had major policy impact, because the government had to respond legislatively and diplomatically.

The response to AAA also shows the court-Parliament relationship. The then government and Parliament responded with the Safety of Rwanda (Asylum and Immigration) Act 2024, which received Royal Assent on 25 April 2024. That does not mean the Court had no influence. The judgment forced the political branches to confront the legal problem and choose a legislative response. It also shows the limit: Parliament can still legislate after a judgment.

These cases support a nuanced judgement. The Supreme Court has become more visible and sometimes more politically consequential. It can stop ministers acting unlawfully, protect access to justice and force Parliament or government to confront legal defects. But it remains limited: it cannot start cases, cannot campaign for reforms, cannot normally rewrite policy and cannot strike down Acts of Parliament in the same way as the US Supreme Court can strike down unconstitutional federal law.

Judicial Review And Ultra Vires

Judicial review is the main way courts check the legality of public power. It is a court process in which a judge reviews the lawfulness of a decision or action made by a public body. The key word is lawfulness. Judicial review is not a general appeal against a policy because someone dislikes the outcome.

Ultra vires means "beyond the powers". In public law, a decision is ultra vires if a minister, local authority, regulator or other public body acts outside the legal powers given to it. This is why judicial review can support parliamentary sovereignty. Parliament passes statutes that give public bodies powers for particular purposes. Courts can then police the boundary and say, in effect, "Parliament did not authorise you to use the power in this way."

A simple route for understanding judicial review is:

The remedy also matters. If a court finds a decision unlawful, it may quash the decision, make a declaration, order a public body to act, prohibit an unlawful action, or sometimes award damages where a legal basis exists. But the normal constitutional pattern is modest: the court often sends the issue back to the public body to remake the decision lawfully. It does not usually substitute its own policy preference.

That is why "judicial review" should not be confused with "judicial supremacy". A judicial review win does not always mean the claimant gets the final substantive outcome they wanted. It may mean the government must go back and make the same decision again using a lawful process and lawful reasoning.

The prorogation case is useful because it tested the limits of prerogative power. Prerogative powers are executive powers recognised by common law, such as some foreign affairs and constitutional powers. In Miller/Cherry [2019], the Court held that the Prime Minister's advice on prorogation was reviewable because courts can decide the legal limits of prerogative power. This was controversial because prorogation is highly political, but the Court's answer was legal: no public power is unlimited simply because it is politically sensitive.

The Rwanda case is useful because it shows judicial review interacting with evidence and rights. The Court assessed whether there were substantial grounds for believing removal to Rwanda would expose asylum seekers to a real risk of refoulement. The judgment turned on law and evidence, including the operation of asylum systems and Article 3 ECHR protections against torture or inhuman or degrading treatment.

The limitation is equally important. Courts are reluctant to decide "merits" questions, such as whether tax should be higher, immigration policy should be stricter or public spending should be allocated differently. Those are normally for ministers and Parliament. Judicial review operates at the boundary between law and politics: it can be politically important precisely because it insists that political power remains legally bounded.

For AQA, a strong paragraph will say both sides. Judicial review strengthens the rule of law by allowing citizens and groups to challenge the state. It also protects Parliament's statutes against executive misuse. But it can be criticised as giving unelected judges influence over controversial policy, especially where rights and proportionality require judges to assess evidence and balance public aims against individual liberty.

Rights And Civil Liberties

The judiciary also protects civil liberties and rights. Civil liberties are freedoms from unjustified state interference, such as liberty, privacy, protest, expression and access to justice. Rights are legal claims protected by statute, common law or the Human Rights Act 1998. In UK politics, the most important point is that rights protection is strong but not fully entrenched against Parliament.

The Human Rights Act 1998 brought many European Convention on Human Rights protections into domestic law. It matters for the judiciary in three main ways.

This is a carefully balanced model. The courts have an important rights-protecting voice, but Parliament keeps legal sovereignty. If a court makes a declaration of incompatibility, the law remains valid and enforceable unless Parliament changes it. That makes the UK different from systems with a codified constitution and constitutional strike-down power.

R (UNISON) v Lord Chancellor [2017] is a strong civil liberties example even though it was not simply a Human Rights Act case. The Supreme Court held that employment tribunal fees were unlawful because they prevented effective access to justice. Access to justice is a constitutional principle because rights are hollow if people cannot enforce them. This case shows judicial influence over government policy through the common law and statutory limits.

R (AAA) [2023] is a strong rights example because it involved asylum, Article 3 ECHR and the principle of non-refoulement. The Court did not say ministers may never pursue third-country asylum processing. It said the policy before the Court was unlawful on the evidence because there was a real risk that people sent to Rwanda could be returned to countries where they faced ill-treatment. The judgment limited executive policy, but through legal standards that Parliament had incorporated or recognised in domestic law.

Rights cases create the debate AQA wants students to evaluate. On one side, judicial protection of rights is essential because majorities and governments can threaten vulnerable individuals or unpopular minorities. Independent courts give citizens a route to challenge unlawful detention, unfair procedures, excessive executive powers and rights-incompatible policy. This supports liberal democracy and the rule of law.

On the other side, rights adjudication can look political. Judges may need to assess proportionality, evidence, risk and the balance between individual liberty and collective security. Critics argue that unelected judges can frustrate manifesto commitments or government policy in areas such as immigration, protest, national security or welfare. The counter-argument is that courts are applying legal duties created by Parliament and common law principles, not inventing a rival manifesto.

The best judgement is therefore not "judges protect rights" versus "Parliament is sovereign". In the UK, both are true in tension. Courts can make rights legally meaningful by interpreting statutes, reviewing executive action and issuing declarations. Parliament can still legislate, amend or override in clear terms. The relationship is a dialogue, but it is an unequal dialogue because Parliament remains the final legal law-maker for primary legislation.

Relationships And Evaluation

The judiciary's relationship with the executive is mainly a checking relationship. Ministers make policy, administer departments, use statutory powers and sometimes use prerogative powers. Courts can review whether that power has been used lawfully. This does not make judges the executive. It means the executive is subject to the rule of law.

The strongest examples show courts checking ministers without taking over policy-making.

The judiciary's relationship with Parliament is more delicate. Courts interpret Acts of Parliament and apply them in real cases. They may expose ambiguity, identify rights problems or interpret statutes in ways ministers did not expect. Parliament can respond by changing the law. This is why UK judicial power is significant but not legally supreme.

AQA answers should avoid two common mistakes.

First, do not treat the UK Supreme Court as if it were exactly like the US Supreme Court. The UK Court cannot strike down Acts of Parliament just because they conflict with a higher codified constitution. It can issue declarations of incompatibility under the Human Rights Act, but those declarations leave the legislation legally valid.

Second, do not treat courts as powerless. Judicial review, rights interpretation and constitutional common law can have major consequences. A court that quashes a ministerial decision can force a policy rethink. A court that declares legislation incompatible can create political pressure. A court that interprets a statute can alter how government powers operate in practice.

This produces the central 25-mark essay tension:

The most persuasive judgement is conditional. The UK judiciary is powerful as a legal check on the executive, especially through judicial review and rights cases. It is less powerful as a direct rival to Parliament, because parliamentary sovereignty remains the central limit. Its political influence has grown because government is legally dense, rights-based claims are common and Supreme Court cases are visible. But its legitimacy depends on staying within a judicial role: deciding lawfully brought legal disputes through independent, impartial and neutral reasoning.

A strong AQA conclusion might say: the UK Supreme Court has not replaced Parliament as the sovereign law-maker, but it has become a crucial constitutional guardian of legality. Its greatest influence is not making policy, but forcing policy-makers to act within powers, respect rights and justify decisions according to law.