Comparing the Supreme Courts and Rights

Both countries have a Supreme Court. Only one of them can overrule the legislature.

The US Supreme Court rests on Article III of the Constitution, which vests judicial power in it but says nothing about striking down legislation. The Court claimed that power for itself. In Marbury v Madison (1803) it held that an Act of Congress conflicting with the Constitution is void, establishing judicial review of federal law. In Fletcher v Peck (1810) it applied the same reasoning to a state law. Those two cases, both named in the specification, are the constitutional foundation of everything the Court does today.

The UK Supreme Court was created by the Constitutional Reform Act 2005 and opened in October 2009, taking over the judicial functions of the Appellate Committee of the House of Lords. It has twelve Justices. Its purpose was institutional separation: removing the highest court from the legislature so that judicial independence would be visible as well as real.

	US Supreme Court	UK Supreme Court
Legal basis	Article III of a codified constitution, 1789	Constitutional Reform Act 2005
Size	Nine Justices	Twelve Justices
Can strike down primary legislation	Yes, as unconstitutional	No
Main power over the executive	Judicial review of constitutionality	Judicial review for ultra vires action
Constraint on the Court	Constitutional amendment, or the Court reversing itself	Parliament can legislate to reverse a ruling

The specification asks about "relative independence". Independence has two components, and each country is stronger on one of them.

Appointment in the USA is political by design. The President nominates, the Senate Judiciary Committee holds hearings, and the full Senate confirms by simple majority. Presidents weigh judicial philosophy, age, ideological reliability and the political benefit of a nomination. Once confirmed, a Justice serves for life during good behaviour, which means a President's influence outlasts the presidency by decades.

Appointment in the UK is insulated from politics. Vacancies are filled through an independent selection commission convened under the Constitutional Reform Act 2005, drawing on the senior judiciary and the judicial appointments bodies of the three legal jurisdictions. There is no confirmation hearing and no parliamentary vote. Justices have security of tenure and a fixed retirement age.

Composition as of September 2026:

• The US Court has a 6–3 Republican-appointed majority, unchanged since Amy Coney Barrett's confirmation in October 2020. Republican appointees are John Roberts (Chief Justice), Clarence Thomas, Samuel Alito, Neil Gorsuch, Brett Kavanaugh and Barrett; Democratic appointees are Sonia Sotomayor, Elena Kagan and Ketanji Brown Jackson. Commentators increasingly describe a three-way split rather than a simple 6–3: a liberal bloc, a centre-right pair in Roberts and Kavanaugh, and a more consistently conservative group.
• The UK Court is led by Lord Reed as President, with Lord Briggs appointed to succeed him in January 2027. Lord Sales has been Deputy President since 12 January 2026. UK Justices are not classified by judicial ideology in the way the specification's own terminology classifies a US conservative Justice or liberal Justice, and none is publicly identified by the party of the government that appointed them.

The trade-off is real. Political appointment gives the US Court democratic input and an ideological character; insulated appointment gives the UK Court neutrality and a weaker claim to overrule elected politicians.

The US Court reviews for constitutionality. It may void an Act of Congress, a state law, or an executive action. That power reaches into the biggest questions of public policy, and post-2005 examples show its range: Citizens United v FEC (2010) on campaign finance, Obergefell v Hodges (2015) on same-sex marriage, and Dobbs (2022), which overturned Roe v Wade and returned abortion law to the states.

Behind those rulings sits the interpretive argument the specification names. Originalists apply the text as it was understood when adopted, and argue that changing its meaning is a job for elected legislators using Article V. Advocates of a Living Constitution argue that an eighteenth-century text can only govern modern life if its principles are applied to modern conditions, and that originalism freezes the law. Critics of judicial activism say it lets nine unelected officials make policy; critics of judicial restraint say it leaves minorities without a remedy when legislatures fail them.

The UK Court reviews for legality, not constitutionality. It has two principal instruments:

• Ultra vires review. Where a minister or public body acts beyond the powers Parliament granted, the courts may quash the action. In R (Miller) v The Prime Minister (2019) the Court held unanimously that the advice to prorogue Parliament for five weeks was unlawful. In R (Miller) v Secretary of State for Exiting the European Union (2017) it held that notification of withdrawal from the EU required an Act of Parliament.
• Declarations of incompatibility. Under the Human Rights Act 1998, courts must read legislation compatibly with Convention rights so far as possible; where that is impossible, a senior court may declare a provision incompatible. The Act stays in force. Parliament decides what to do next, and in practice has usually amended the law.

The comparison to make is that the UK Court is powerful against ministers and powerless against Parliament, while the US Court is powerful against both.

Worked example — how a UK court reins in a Prime Minister. R (Miller) v The Prime Minister (2019) shows the UK route running end to end, and each step has a US counterpart that works differently.

1. The action. In late August 2019 the Prime Minister advised the Queen to prorogue Parliament for five weeks, in the run-up to the then Brexit deadline of 31 October 2019.
2. The question the Court asked. Not whether the decision was wise, which is a political judgement, but whether the advice fell inside the legal limits on the prerogative power to prorogue.
3. The test applied. A prorogation is unlawful if it frustrates or prevents, without reasonable justification, Parliament's ability to perform its constitutional functions.
4. The finding. All eleven Justices held the advice unlawful. The prorogation was void and of no effect, so in law Parliament had not been prorogued and sat again the next day.
5. What did not happen. No Act was struck down and no statute was reinterpreted. The Court policed the edge of an executive power and left Parliament's authority untouched.

Set that against the tariff ruling of February 2026, where the US Court measured presidential action against a statute and against the Constitution itself, and where the same power would have let it void an Act of Congress it judged unconstitutional. The UK Court measured an executive act against common law limits, because there is no higher text to measure it against.

	USA	UK
Principal source	The Constitution, the Bill of Rights (1791) and later amendments	Human Rights Act 1998, Equality Act 2010, common law
Status	Entrenched; a law that breaches them can be voided	Ordinary statute; Parliament may amend or repeal it
Enforcement	Litigation before federal courts, ending at the Supreme Court	Judicial review, and declarations of incompatibility
Effect of a court win	The offending law ceases to have effect	Executive action may be quashed; an Act remains in force
Main risk	Nine unelected Justices decide contested moral questions	A determined parliamentary majority can narrow rights

Worked example — how the same kind of victory differs. In Brown v Board of Education (1954) the NAACP's litigation strategy produced a ruling that segregated schooling was unconstitutional. The ruling changed the constitutional position at a stroke, though enforcement took a further decade and turned on the Civil Rights Act 1964 as much as on the Court. A UK campaign group cannot even reach that starting point against a statute. Its route is a declaration of incompatibility, which produces political pressure rather than legal change, or judicial review of how a minister has used a statutory power, which strikes at the decision rather than the law behind it. American rights politics is therefore litigated; British rights politics is legislated and lobbied.

Paper 3A 4.5 also requires attention to race and rights, where the US record is mixed: voting rights, affirmative action and representation remain contested, and the 2025–26 term produced ideologically split rulings on the Voting Rights Act, campaign finance, transgender athletes and immigration.

The specification asks about "the effectiveness of interest groups in the protection of civil rights in the USA and the UK". Note the terminology: Issue 4 uses interest groups wherever the context is purely American, as 6.2.7 does. The comparative bullet at 6.2.9 reads "pressure/interest groups" because it spans both countries.

US interest groups litigate. The separation of powers, federalism and an entrenched Bill of Rights give them a route that does not run through elected politicians. They fund test cases, choose sympathetic plaintiffs and jurisdictions, and file amicus curiae briefs. The NAACP built Brown over years of preparatory litigation; the American Civil Liberties Union pursues free speech and due process cases; the National Rifle Association has litigated and lobbied around the Second Amendment. Groups also work the appointment process, campaigning for and against nominees whose rulings will outlast the President who named them.

UK pressure groups lobby. With no power to strike down an Act, groups such as Liberty, Stonewall and the Howard League for Penal Reform concentrate on influencing legislation, briefing peers, giving evidence to select committees and shaping public opinion. Judicial review and intervention in Supreme Court cases are used, but as one tactic among several rather than as the main route.

Assessing effectiveness requires care in both directions. US groups can achieve transformative change through a single ruling, but that change is vulnerable to reversal by a differently composed Court, as Dobbs demonstrated in 2022. UK groups cannot win outright, but a statutory change they secure is stable while Parliament leaves it alone. Neither system is straightforwardly better at protecting rights; they fail in different places.

The sharpest current question is whether a Court with a clear ideological majority still checks a President of the party that appointed most of it. Pearson's April 2026 case study puts the evidence squarely.

• In February 2026 the Court held that the President could not use the International Emergency Economic Powers Act 1977 to impose sweeping import tariffs, because the Constitution reserves taxing powers to Congress and the statute makes no reference to tariffs or duties. Chief Justice Roberts and two Trump appointees, Barrett and Gorsuch, joined the three liberal Justices.
• In December 2025 the same six held that the President lacked authority to take control of the Illinois National Guard and deploy it to Chicago over the objections of local officials.
• Across 26 rulings on challenges to Trump administration actions in 2025, the administration won 21.

Read together, the record shows a Court that sides with the administration in most cases but sets limits in a few high-profile ones. Critics who argue the Court is politically compromised cite the July 2024 ruling that a President is immune from criminal prosecution for most official acts. Defenders point to the tariff and National Guard rulings as proof that Article III still functions as a check.

The UK comparison is instructive. Miller (2017) and Miller (2019) both went against the government of the day, and both were followed. Neither required a codified constitution: they turned on statutory interpretation and common law principle.

Structural. A codified, entrenched constitution needs an authoritative interpreter, so the US Court's power follows from the document rather than from the character of its Justices. Parliamentary sovereignty leaves no room for an equivalent, so the UK Court reviews the legality of executive action instead of the validity of statute. Structure also explains the appointment contrast: separation of powers requires a check on judicial selection, which is why the Senate confirms, while the UK's fusion of executive and legislature made an independent commission the only credible safeguard.

Rational. Individual actors behave according to their incentives. A President nominates a young Justice whose judicial philosophy is predictable, because a life appointment extends his influence for decades. Senators calculate the electoral cost of a confirmation vote. Interest groups choose the arena where their resources buy most: litigation in the USA, where a single ruling can change national law, and lobbying in the UK, where Parliament holds the pen. Justices themselves face incentives too, and the tariff ruling can be read as a Court protecting its own institutional standing.

Cultural. Shared values explain the different tolerance for judicial power. Americans have long accepted courts as legitimate arbiters of moral and political questions, and rights language saturates political debate. British culture has treated elected politicians as the proper decision-makers and judges as technicians, which is why accusations of judicial over-reach follow rulings like Miller (2019). The originalism against Living Constitution argument is itself cultural: a dispute about what the founding text means to the community that reveres it.

1. Saying the UK Supreme Court can strike down laws

It cannot. It quashes unlawful executive action and may declare an Act incompatible with Convention rights. Getting this wrong invalidates the comparison it appears in.

2. Treating judicial review as one thing

The term means constitutional review in the USA and review of the legality of public bodies in the UK. Define which one you are discussing before you compare them.

3. Assuming a 6–3 majority decides every case

The evidence cuts both ways. The administration won 21 of 26 challenges in 2025, and lost the National Guard case in December 2025 and the tariff case in February 2026 with two of its own appointees in the majority against it.

4. Using "pressure groups" for the USA

Issue 4 amended the wording to interest groups wherever the context is purely American, which is how 6.2.7 reads. The comparative bullet at 6.2.9 keeps "pressure/interest groups" because it covers both countries, so use the board's terminology in the board's context rather than assuming one word everywhere.

5. Leaving the composition undated

Court composition is examinable and changes. Write "as of September 2026" and note Lord Briggs's succession in January 2027, rather than a bare present tense that will be wrong by the time it is read.

6. Confusing judicial neutrality with judicial independence

Neutrality is about how a judge decides: on the law, not on personal preference. Independence is about who can pressure them. A court can be independent and non-neutral, which is the heart of the criticism levelled at the US Court.