Ireland v. United Kingdom (Again): The UK’s 1977 “Five Techniques” Undertaking and the Legacy Act

[William Worster has taught public international law, the law of international organizations and international migration and refugee law at The Hague University of Applied Sciences for more than seventeen years]

Introduction

In February 1977, at the climax of Ireland v. United Kingdom, the UK Attorney-General stood before the European Court of Human Rights (ECtHR) and gave an “unqualified undertaking” that the so-called “five techniques” – wall-standing, hooding, subjection to noise, sleep deprivation, and deprivation of food and drink – “will not in any circumstances be re-introduced as an aid to interrogation.” In making this pledge to the Court, the UK undertook a legal obligation, grounded in good faith participation, to the Court itself. The Court took note of the pledge and recorded it in its 1978 judgment. The pledge was never withdrawn.

Nearly five decades later, the UK Parliament enacted the Northern Ireland Troubles (Legacy and Reconciliation) Act 2023 (Legacy Act). The Legacy Act provides for three core measures: (1) conditional immunity for Troubles-related offences; (2) curtailment of civil actions; and (3) restrictions on inquests and evidence.

Following the enactment of the Legacy Act, Ireland brought an inter-State application before the ECtHR. Ireland’s new inter-State application challenges the Act under Articles 2, 3, and 6 of the European Convention on Human Rights (ECHR). Most debate has rightly focused on Article 3’s investigative and accountability duties. But there is a second possible argument: the UK’s unilateral pledge to the Court in 1977. This post argues that the 1977 pledge was made to the Court to address the Article 3 issue (prohibition of torture), so its content must be read systemically with Article 3’s full meaning. That meaning includes not merely abstaining from using the five techniques, but also maintaining the enforcement architecture that prevents their use. On that reading, the Legacy Act, as it currently stands, not only violates Article 3, but it also violates the UK’s 1977 undertaking.

In September 2025, the UK and Irish governments unveiled a Joint Framework to make changes to the Legacy Act and address Ireland’s complaints. The Joint Framework pledges some measures that could move toward compliance. The UK has introduced the Northern Ireland Troubles Bill, which remains pending.

What the UK Pledged, and to Whom

The 1977 pledge was binding on the UK and required it to stop using the five techniques. In other scholarly work, this author has argued (i) that unilateral undertakings made to international tribunals can be legally binding, and (ii) that such assurances are binding due to the State’s duty of good faith participation owed to the court/tribunal. Not every litigation statement is binding. However, a unilateral undertaking to a court/tribunal will be so when it is public, specific, unconditional, and made by a competent state authority with objective intent to commit. The International Court of Justice (ICJ) held as much in several  cases. Arbitral tribunals, conciliation commissions, claims commissions and similar bodies have held the same.

The 1977 statement was public, precise, unconditional, and delivered by a competent authority in open court. Two features matter: (1) the addressee and (2) the function. Regarding the addressee, the promise was addressed to the ECtHR, not to Ireland. The UK’s objective was to give the Court the assurance and confidence that the five techniques would not recur. As for its function, the promise addressed the Article 3 issue before the Court. The Court then proceeded to judgment and placed the undertaking on the record, where it remains. Thus, it is not a Nuclear Tests-style unilateral declaration. Instead, it is a focused pledge given to the Court itself whose binding force arises from the state’s duty of good faith cooperation. As a result, while the UK owes Ireland (and all contracting parties) duties inter partes under Article 3, it also undertook a distinct obligation under international law directly to the Court itself not to reintroduce the five techniques.

Evidence the Promise Has Already Been Breached

Credible post-1977 evidence shows continued use of the five techniques, including in Iraq. In the inquiry into the death of Baha Mousa, hooding and stress positions were used and the public inquiry confirmed continued use of the five techniques. In the Camp Breadbasket matter, photographs showed UK soldiers hooding detainees and using stress positions. Reporting and several official Parliamentary and Governmental investigations identified continued hooding/sensory deprivation in Iraq and Afghanistan, followed by renewed guidance to stop it.

Interaction of the Pledge and Article 3

Nothing in the Legacy Act specifically authorizes renewed use of the five techniques. But that is not the issue. The question is whether the Act dismantles the enforcement architecture that Article 3 requires and upon which the pledge necessarily depends. Immunity undercuts the possibility of punishment for past use, removing the chief deterrent against future use. Civil and inquest limitations restrict truth-finding, public scrutiny, and victim redress, the mechanisms by which courts, prosecutors, and the public enforce norms against mistreatment.

In the abstract, a pledge that the five techniques “will not be re-introduced” looks like an obligation of result. Read in context, this solemn assurance to the ECtHR about an Article 3 dispute must be understood through Article 3’s settled content. First, Article 3 prohibits torture, inhuman or degrading treatment, including any reintroduction of the five techniques “in any circumstances.”  Second, Article 3 also demands certain positive obligations, such as effective investigation and, sometimes, preventive duties.

If a State promises a result, good faith interpretation gives the promise effet utile. It contains whatever minimal enforcement is indispensable to realize its result. For the five techniques, that requires, at a minimum, credible deterrence and accountability through investigation, along with access to evidence and redress. Without these, any promise is rendered empty.

Unilateral undertakings such as the UK’s pledge are indeed interpreted restrictively, but the pledge’s text, circumstances, and purpose are inseparable. The pledge was given to address an Article 3 question before the ECtHR. In that setting, “in any circumstances” can only be meaningful if the state preserves the minimum enforcement to deliver on its pledge. Pledges are assessed against credibility and reliability. On that reading, the UK’s Legacy Act breaches the 1977 pledge, not because the pledge is a free-standing code of procedures, but because a pledge given to the Court must be read within the context of Article 3’s obligations.

Substantive Breach and Procedural Abuse

International tribunals are open to the use of pledges to them, but they do not accept them without question. Courts measure assurances against the risk that the judicial function will be frustrated. In Certain Documents, the ICJ took note of a pledge, but still imposed provisional measures where it was deemed inadequate. The ECtHR’s practice with Rule 39 and friendly settlements is similar. The UK’s 1977 promise was implicitly founded on the existing enforcement system. The Legacy Act undermines that system.

Two distinct but mutually reinforcing wrongs emerge, a substantive breach and a procedural breach. The substantive breach (Article 3 read through the pledge) comes from the pledge’s content, with reference to Article 3’s full meaning. By extinguishing or limiting prosecutions, civil remedies, and inquests, the Act contradicts the pledge and Article 3.

Article 38 obliges States to furnish “all necessary facilities” for the Court’s examination of cases. Because the pledge directly implicates the UK’s obligation to participate in good faith, and was given in the context of an actual pending dispute (the prior Ireland v UK case), the UK owes the Court on-going obligations in relation to that matter. Specifically, legislation that blocks investigations and limits evidence in the very area the Court relied upon frustrates the Court’s function of verifying compliance. Those effects constitute procedural bad faith, an abuse of process, and are independently actionable under Article 38.

Claiming the Violation and Seeking Remedies

Following from the above, Ireland can make three arguments regarding the 1977 pledge: (1) The Legacy Act’s immunity, civil bars, and inquest/evidence restrictions are incompatible with duties to investigate, prosecute, and punish because they create impunity. (2) The pledge, being to the Court and given to address an Article 3 problem, must be read in light of Article 3’s duties of conduct. By enacting the Act, the UK has dismantled the enforcement necessary to give the undertaking effect and is therefore in breach of it. (Ireland may also submit evidence of breaches since the pledge.) (3) Alternatively, and because the undertaking was given directly to the Court, under Article 38, the UK owes the Court a duty of good faith cooperation not to frustrate the Court’s reliance on and supervision of that promise. The Act thus obstructs the Court’s function, amounting to an independent procedural violation.

If the Court accepts one, two or all three of these arguments, the remedy is straightforward. The Court can find a violation of both Article 3 (substantive) and, as appropriate, Article 38 (procedural). The Court can indicate general measures under Article 46, including repeal or substantial amendment of the Legacy Act (narrowly, the impunity-creating provisions of immunity, civil-action bars, and inquest/evidence restrictions). This could include enhanced supervision by the Committee of Ministers to ensure meaningful investigations and prosecutions can proceed.

Because the pledge was directed to the Court, there is a particularly strong case for the Court to indicate measures of non-repetition that restore the enforcement architecture the pledge relied on. First, although not determinative as to the outcome, the Court took the undertaking into account in adjudicating the case, so identifying concrete non-repetition measures is necessary to preserve the legal value of assurances on which the Court relies. Second, the Court has an institutional interest in ensuring that parties do not neutralize any undertakings through domestic legislation that impairs verification and accountability. Third, if solemn undertakings to Strasbourg can be disregarded, then it creates incentives for other states to make bad faith pledges to the Court. And given the broken promise, courts and treaty bodies, should be more skeptical of future UK undertakings.

If the UK adopts new legislation to amend the Legacy Act, as it appears may be happening, it will be critical that the revised law eliminates immunity; resumes inquests with resources; establishes a Legacy Commission with true independence, evidence powers, and referrals to prosecution; and provides safeguards for veterans that are compatible with effective fact-finding.

Conclusion

The 1977 undertaking was not a rhetorical flourish. It was a public, unconditional promise to the Court, recorded in the Court’s judgment, and binding under international law. It created obligations on the UK toward the Court and did not disappear when the Court issued its judgment. And it remains in place notwithstanding the proposed Joint Framework between the UK and Ireland.

Because it was made to the Court and aimed at addressing an Article 3 problem, the pledge must be read with Article 3’s full meaning. That means the pledge is not just “we will not use the techniques,” but “we will keep in place the means to operationalize the commitment.” By adopting the Legacy Act, legislation that limits those means, the United Kingdom has not only violated Article 3, but it has also broken its own promise to the Court.

That act has two legal consequences. First, the Act breaches the UK’s duties inter partes under the Convention, vis-à-vis Ireland and the community of contracting parties erga omnes partes. Second, it breaches a distinct obligation freely undertaken to the Court itself, a court-directed pledge whose frustration also engages Article 38 as a matter of procedural bad faith. The Court should recognize the dual breach and require legislative change that restores the enforcement architecture the pledge presupposes.

The proposed Joint Framework might support a friendly settlement of the inter-State application if any new UK legislation replicates measures that comply with Article 3 (effective investigations, resumed inquests, no blanket impunity) and includes cross-border cooperation now promised by Dublin (new Garda unit, statutory cooperation duties). If the UK is serious about avoiding the inter-state case brought by Ireland, it will need to address not only its Article 3 violation, but the related promise it made in 1977. It needs to reconcile not only with Ireland, but also with the Court.

Photo Attribution: “Great Britain-United Kingdom Topographic Map” by physicalmap.org is licensed under CC BY-SA 4.0