EU Court of Justice Judgements After Brexit — Do They Still Apply? (CIPD 5OS01 AC 3.1)
Why Trust This Assignment?
- AC 3.1CIPD 5OS01requires the student to prepare a briefing note explaining the legal status of European Court of Justice judgements made prior to the UK's departure from the European Union on 31 January 2020. The European Union (Withdrawal) Act 2018 is the primary statutory authority: it converted pre-exit ECJ decisions into "retained EU case law" — a defined legal category that remains binding on Employment Tribunals and Employment Appeal Tribunals in the UK. Post-exit ECJ decisions carry persuasive authority only. No UK court is obligated to follow them, though courts retain discretion to consider them. The answer to "do ECJ judgements still apply?" is therefore nuanced: pre-exit decisions are preserved and largely binding on lower courts; post-exit decisions are not binding on any UK court.
CIPD 5OS01 AC 3.1 requires the student to prepare a briefing note explaining the legal status of European Court of Justice judgements made prior to the UK’s departure from the European Union on 31 January 2020. The European Union (Withdrawal) Act 2018 is the primary statutory authority: it converted pre-exit ECJ decisions into “retained EU case law” — a defined legal category that remains binding on Employment Tribunals and Employment Appeal Tribunals in the UK. Post-exit ECJ decisions carry persuasive authority only. No UK court is obligated to follow them, though courts retain discretion to consider them. The answer to “do ECJ judgements still apply?” is therefore nuanced: pre-exit decisions are preserved and largely binding on lower courts; post-exit decisions are not binding on any UK court.
AC 3.1 — The Senior Manager Briefing Requirement
AC 3.1 of CIPD 5OS01 Specialist Employment Law requires the student to prepare a written briefing note for a senior manager on the legal status of ECJ judgements since Brexit. The typical scenario frames the student as an HR professional whose senior manager has asked for clarity on whether the EU case law that underpinned their organisation’s employment law advice before 2020 still carries legal weight. The assessment criterion demands an explanation that is accurate, plainly expressed, and legally precise — not a general commentary on Brexit.
At distinction level, the AC 3.1 briefing note names the European Union (Withdrawal) Act 2018 by full title and by relevant section references (s.6(3), s.6(4), s.6(7)). It distinguishes explicitly between pre-exit ECJ decisions (retained EU case law, binding on lower courts) and post-exit ECJ decisions (persuasive authority only). It identifies which courts can depart from retained EU case law and what standard applies. A pass-level answer describes the general position — ECJ decisions are “no longer binding” — without the statutory grounding that accurately captures the retained EU case law framework. That general description is incorrect in important respects and would receive no credit at distinction level.
The Role of the ECJ in UK Law Before Brexit
Before 31 January 2020, the European Court of Justice governed the interpretation of EU law across all member states, including the United Kingdom, through the mechanism of the European Communities Act 1972. The ECJ, formally named the Court of Justice of the European Union (CJEU), functioned as the supreme interpreter of EU treaties, directives, and regulations. Where a question of EU law arose in a UK court, the UK court was required to apply EU law as the ECJ had interpreted it, or to make a preliminary reference to the ECJ under Article 267 of the Treaty on the Functioning of the European Union for a ruling on the question.
The European Communities Act 1972 achieved EU law supremacy in domestic UK law through two mechanisms. First, it gave effect to directly applicable EU law (regulations and treaty provisions) as a matter of UK law without requiring further domestic implementation. Second, it required UK courts to apply EU law in preference to conflicting provisions of UK statute — a principle confirmed by the House of Lords in R v Secretary of State for Transport, ex parte Factortame [1990] ECJ, where the Factortame line of cases established that EU law could disapply an Act of Parliament where the two conflicted.
The supremacy doctrine originated in the ECJ’s own jurisprudence: Costa v ENEL [1964] established that EU law takes precedence over the laws of member states. Van Gend en Loos [1963] established the doctrine of direct effect — that certain EU law provisions confer rights on individuals that national courts must enforce without any domestic implementing measure being required.
For the broader constitutional context of how these doctrines fit within the UK employment law framework, that page covers the legislative hierarchy from which UK employment rights flow.
The practical HR implication before Brexit was that ECJ decisions on directives such as the Working Time Directive, the Equal Treatment Directive, and the Transfer of Undertakings Directive were directly authoritative in UK employment law. An Employment Tribunal was required to follow ECJ interpretations of those directives as binding precedent.
Exit Day and the EU (Withdrawal) Act 2018 — Retained EU Case Law
The European Union (Withdrawal) Act 2018 preserved pre-exit ECJ decisions as retained EU case law within the UK domestic legal system. Exit day was 31 January 2020. On that date, the European Communities Act 1972 was repealed, removing the mechanism through which EU law had supremacy over conflicting UK statute. EU law ceased to have direct effect or supremacy in UK law from that moment.
The EU (Withdrawal) Act 2018 created a new legal category to manage the transition: retained EU case law. Under s.6(7) of the Act, “retained EU case law” covers any principles laid down by, or decisions of, the European Court of Justice before exit day, so far as relevant to any matter before a UK court or tribunal. These decisions were not deleted or discarded — they were converted into a species of UK domestic law binding on courts in the same way as other precedent sources, subject to the departure powers described below.
The distinction between pre-exit and post-exit decisions is expressed clearly in s.6(3) of the EU (Withdrawal) Act 2018: “Any question as to the validity, meaning or effect of any retained EU law is not to be decided in accordance with any decision made by the European Court of Justice on or after exit day.” In plain terms, UK courts are not bound by, and must not follow as binding authority, any ECJ decision issued on or after 31 January 2020.
The departure power for the higher courts is set out in s.6(4): the UK Supreme Court and the Court of Appeal may depart from retained EU case law if they consider it right to do so, applying the same approach they use when departing from their own previous decisions. The Supreme Court issued a Practice Statement in 2020 confirming it will apply a high threshold before exercising this power, equivalent to the threshold for departing from its own precedents — a rare step requiring a compelling reason.
The Retained EU Law (Revocation and Reform) Act 2023
The Retained EU Law (Revocation and Reform) Act 2023 introduced significant controversy during its passage through Parliament. In its original form, the Bill contained a sunset clause that would have revoked all retained EU law by 31 December 2023 unless it was specifically restated by secondary legislation. Had the sunset clause been enacted, thousands of pieces of retained EU legislation — including the Working Time Regulations 1998 and TUPE — would have been at risk.
The sunset clause was abandoned before the Bill received Royal Assent. The enacted Retained EU Law (Revocation and Reform) Act 2023 therefore did not revoke the general body of retained EU law. Retained EU case law — pre-exit ECJ decisions preserved under the EU (Withdrawal) Act 2018 — remains in force. UK courts remain not bound by post-exit ECJ decisions, as specified in s.6(3) of the 2018 Act, which the 2023 Act did not alter in this respect.
For CIPD AC 3.1 purposes, the correct answer is that retained EU case law survives. Students who write that “retained EU law was revoked in 2023” are stating an incorrect legal position. The sunset clause was proposed but dropped. Retained EU case law remains binding on lower courts.
Which UK Courts Are Bound by Retained EU Case Law?
Retained EU case law remains binding on the Employment Tribunal and the Employment Appeal Tribunal. Neither court has the power to depart from a pre-exit ECJ decision. Where a question of EU-derived employment law arises before an Employment Tribunal — for example, an interpretation of the Working Time Regulations 1998 that turns on the meaning of the Working Time Directive — the Tribunal must apply pre-exit ECJ decisions on that Directive as binding authority.
The Employment Appeal Tribunal is equally bound by retained EU case law and lacks the departure power available to higher courts.
The Court of Appeal occupies an intermediate position. Under s.6(4) of the EU (Withdrawal) Act 2018, the Court of Appeal may depart from retained EU case law if it considers it right to do so. This power is available but subject to the same high threshold that applies when the Court of Appeal departs from its own previous decisions.
The UK Supreme Court holds the broadest departure power. Its 2020 Practice Statement confirmed the approach: departing from retained EU case law is possible but requires compelling reason — the same standard applied when the Supreme Court departs from its own previous rulings under the 1966 Practice Statement.
The practical implication for HR practitioners is significant: for most employment law disputes, the relevant court is the Employment Tribunal or the Employment Appeal Tribunal. Before those courts, retained EU case law is fully binding. An employer or HR practitioner who believes Brexit has made pre-exit ECJ decisions irrelevant has misunderstood the retained EU case law framework established by the EU (Withdrawal) Act 2018.
For more detail on which specific employment law rights originated from EU directives and their current status in UK domestic law, the EU employment law post-Brexit guide covers working time, equal treatment, TUPE, and related employment rights in detail.
Post-Brexit ECJ Decisions — Persuasive Authority Only
ECJ decisions issued on or after 31 January 2020 carry persuasive authority only in UK courts. A persuasive authority is one a court may find useful in reaching its decision but is not obligated to follow. It stands in contrast to binding authority, which a court must apply regardless of its own view of the merits.
Post-exit ECJ decisions are not binding on the Employment Tribunal, the Employment Appeal Tribunal, the Court of Appeal, or the UK Supreme Court. Any of these courts may choose to follow a post-2020 ECJ decision as a matter of reasoning — if it finds the analysis persuasive in resolving a question of employment law — but this is discretionary. The court is equally free to reach a different conclusion without needing to justify a departure, because departure from persuasive authority carries no precedential consequences.
The employment law significance is that the ECJ continues to develop EU employment law after Brexit. Decisions on the Working Time Directive, the GDPR, the Equal Treatment Directive, and TUPE continue to be issued by Luxembourg. UK courts may look at these developments for guidance. They are also free to diverge. Post-2020 divergence between UK and EU employment law is now legally possible for the first time since the European Communities Act 1972 first brought EU law into domestic effect.
For AC 3.1 purposes, the student must avoid two opposite errors. The first error is stating that ECJ decisions “no longer apply” — which is incorrect because pre-exit decisions remain binding as retained EU case law. The second error is stating that “EU law still applies” without qualification — which overstates the position by failing to distinguish between retained pre-exit decisions and non-binding post-exit decisions.
What Does This Mean for HR Practitioners Advising on Employment Law?
The retained EU case law framework has a direct and continuing impact on HR practitioners advising on employment rights that derive from EU directives. Working time entitlements under the Working Time Regulations 1998, equal treatment protections under the Equality Act 2010, and employee protections on business transfers under TUPE all trace their legislative origins to EU directives — and the pre-exit ECJ decisions that interpreted those directives remain binding authority before Employment Tribunals. Practitioners who assume Brexit has cleared the board of EU-derived case law are operating on an incorrect legal assumption. The supplementary content below covers the Marleasing indirect effect principle as a worked example and sets out the briefing note format expected for AC 3.1.
Marleasing and the Principle of Indirect Effect — A Worked Example
Indirect effect is the principle that national courts must interpret domestic legislation consistently with the EU directive it was designed to implement, even where the domestic legislation does not expressly require that interpretation. This principle was established in Marleasing SA v La Comercial Internacional de Alimentacion SA [1990] ECJ C-106/89, where the ECJ held that national courts are required “in so far as possible” to interpret domestic law in the light of the wording and purpose of the relevant EU directive.
Marleasing is retained EU case law. The Employment Tribunal must apply it as binding authority when interpreting domestic legislation that implements an EU directive.
The CIPD 5OS01 specialist employment law example page applies these principles to a complete worked assignment, demonstrating how to reference Marleasing and the retained EU case law framework in an AC 3.1 briefing note.
What Marleasing Established and Why It Still Matters
Marleasing SA v La Comercial Internacional de Alimentacion SA [1990] ECJ C-106/89 established that national courts must interpret national law “as far as possible” in conformity with EU directives — the principle of indirect effect. The “as far as possible” limitation was further developed in Pfeiffer v Deutsches Rotes Kreuz [2004] ECJ, which clarified that the conforming interpretation duty applies to the whole body of national law, not just the specific implementing provision.
Post-Brexit, Marleasing is retained EU case law under the EU (Withdrawal) Act 2018 s.6(7). An Employment Tribunal must therefore apply the Marleasing indirect effect principle as binding authority when it interprets the Working Time Regulations 1998, which were enacted to implement the Working Time Directive 93/104/EC. If a claimant argues that the Regulations must be read consistently with the Directive on a point where the Regulations are ambiguous, the Tribunal must apply the Marleasing duty. It cannot simply ignore the Directive because the UK has left the EU.
This is the practical working of retained EU case law in employment disputes. HR practitioners advising on working time compliance — rest breaks, reference periods, holiday carryover — must account for the fact that pre-exit ECJ decisions interpreting the Working Time Directive remain the authoritative starting point before Employment Tribunals.
How to Structure the AC 3.1 Briefing Note
A CIPD Level 5 briefing note follows a formal structure with a clear title, an executive summary of the legal position, a body section with the detailed legal analysis, and a concluding paragraph that draws implications for the organisation. The AC 3.1 briefing note is addressed to a senior manager who needs to understand the post-Brexit legal position on ECJ decisions — not to a qualified lawyer. The language should be formal, precise, and free of academic padding.
The opening paragraph should state the position clearly: pre-exit ECJ decisions have been preserved as retained EU case law under the EU (Withdrawal) Act 2018 and remain binding on the Employment Tribunal; post-exit ECJ decisions are persuasive only. The body should then explain the retained EU case law mechanism by section reference and identify which courts are bound. The closing paragraph should draw the HR implication: employment rights from EU directives remain enforceable through retained implementing legislation.
For a complete model briefing note applying this structure to a CIPD case study, the CIPD 5OS01 specialist employment law example page contains a full AC 3.1 worked answer at distinction level.
Distinction-Level Markers for AC 3.1
A distinction-level AC 3.1 briefing note demonstrates five characteristics. First, it names the European Union (Withdrawal) Act 2018 by full title and cites the relevant sections: s.6(3) for the rule that post-exit ECJ decisions are not binding; s.6(4) for the departure power available to the Supreme Court and Court of Appeal; and s.6(7) for the definition of retained EU case law. Second, it explicitly distinguishes between pre-exit decisions (retained, binding on lower courts) and post-exit decisions (persuasive only). Third, it identifies the courts that may depart from retained EU case law and states the departure standard. Fourth, it references at least one retained ECJ case by name and citation — Marleasing [1990] ECJ C-106/89 for indirect effect, or Factortame [1990] ECJ for the supremacy doctrine. Fifth, it notes the practical HR implication: employment rights from EU directives remain enforceable through retained implementing legislation. A pass-level answer describes the general post-Brexit position without statutory section references or case citations.
Frequently Asked Questions — ECJ Judgements and Post-Brexit UK Law
Can UK courts ever follow a post-Brexit ECJ decision?
Yes. While no UK court is bound by a post-Brexit ECJ decision, any court may choose to follow such a decision as persuasive authority. The Employment Tribunal and Employment Appeal Tribunal have discretion to take account of post-2020 ECJ reasoning where they find the analysis helpful in resolving a question of employment law — but this is discretionary, not obligatory. An employer cannot guarantee that a post-Brexit ECJ decision will be applied in UK litigation, only that it may be considered. The court remains free to reach a different conclusion without treating the post-exit decision as binding in any way.
Which courts can depart from retained EU case law?
Under the European Union (Withdrawal) Act 2018 s.6(4), only the UK Supreme Court and the Court of Appeal have the power to depart from retained EU case law. Lower courts — including the Employment Appeal Tribunal and all Employment Tribunals — must continue to apply pre-exit ECJ decisions as binding authority. They have no departure power. The Supreme Court issued a Practice Statement in 2020 confirming it will apply a high threshold before departing from retained EU case law, equivalent to its approach when reconsidering its own precedents under the 1966 Practice Statement.
Has any UK court departed from pre-Brexit ECJ case law since 2020?
The departure power under s.6(4) of the EU (Withdrawal) Act 2018 has been available since exit day on 31 January 2020, but the Supreme Court and Court of Appeal have exercised it sparingly. For CIPD AC 3.1 purposes, the critical point is that departure is legally possible for those two courts but has not become routine. The Employment Tribunal and Employment Appeal Tribunal — where the overwhelming majority of employment disputes are resolved — have no power to depart and remain fully bound. Students should not state that all retained EU case law is freely open to revision; the revision power is confined to two courts and requires compelling justification to exercise.