Chief Constable of the Police Service of Northern Ireland & Anor v Agnew & Ors (Northern Ireland) [2023] UKSC 33

Police officers and civilian staff claimed underpaid holiday pay dating back to 1998, as their pay excluded overtime. The Supreme Court held that the EU principle of equivalence allowed police officers to benefit from the 'series extension' for bringing claims, and that a series of deductions is not broken by gaps exceeding three months or by intervening lawful payments.

Facts

The Respondents, comprising police officers and civilian staff of the Police Service of Northern Ireland, brought claims before the Industrial Tribunal to recover sums which should have been paid as part of their holiday pay since November 1998. They had only been paid basic pay when taking annual leave, whereas EU Working Time Directives required payment of ‘normal pay’ including overtime for the four weeks of leave derived from EU law. The Appellants accepted the underpayment but disputed how far back claims could extend, relying on a three-month limitation period in the Working Time Regulations (Northern Ireland).

The Legislative Framework

The Working Time Regulations (Northern Ireland) 2016 (and its predecessor, the 1998 Regulations) implemented the EU Working Time Directives, entitling workers to four weeks paid annual leave. Regulation 43(2)(a) imposed a three-month time limit for bringing complaints. However, Article 55(3) of the Employment Rights (Northern Ireland) Order 1996 (ERO) permitted claims for a ‘series of deductions’ if made within three months of the last deduction in the series.

Issues

The appeal raised two principal issues:

1. Whether police officer Respondents could rely on the ‘series extension’ in Article 55(3) ERO when they were not ‘workers’ within the ERO’s definition.
2. What constitutes a ‘series’ of deductions, and specifically whether a series is broken by a gap of more than three months between deductions or by an intervening lawful payment.

Judgment

The Principle of Equivalence

The Supreme Court held that the EU principle of equivalence required that the series extension available under the ERO be imported into claims under the Working Time Regulations. The Court stated:

The principle of equivalence requires that the rule at issue be applied without distinction, whether the infringement alleged is of Community law or national law, where the purpose and cause of action are similar.

Lord Kitchin and Lady Rose, delivering the judgment, concluded that claims under Article 55 ERO and regulation 43(1) WTR (NI) 2016 were comparable, both being tribunal proceedings with similar objectives of enabling proper remuneration to be paid to workers. The Court rejected the Appellants’ argument that police officers could not rely on ERO procedures because they were excluded from that regime’s definition of ‘worker’. The principle of equivalence does not require the claimant to be within the class who could bring a claim under the comparator provision; rather, it imports the more favourable procedural rules into the enforcement of their existing rights.

The Meaning of ‘Series’

The Court rejected the reasoning in Bear Scotland Ltd v Fulton [2015] ICR 221 that a gap of more than three months necessarily breaks a series. Lord Kitchin and Lady Rose explained:

An important purpose of the series extension is to allow workers or employees, in an appropriate case, to complain about acts or failures which occur outside the three-month period preceding the complaint.

The Court held that whether deductions constitute a ‘series’ is essentially a question of fact. The word ‘series’ means a number of things of a kind following each other in time. Key factors include similarities and differences between deductions, their frequency, size and impact, how they came to be made, and what links them together. A series is not necessarily broken by a gap exceeding three months, nor by an intervening lawful payment. In these appeals, each unlawful deduction was factually linked to its predecessor by the ‘common fault or unifying vice’ that holiday pay was calculated by reference to basic pay rather than normal pay.

Other Issues

The Court upheld the Court of Appeal’s findings that: (i) annual leave from different sources need not be taken in a particular order; (ii) the appropriate method for calculating holiday pay should compare like with like (working days, not calendar days); and (iii) the reference period for calculating normal pay is a question of fact.

Implications

This decision has significant implications for holiday pay claims across the United Kingdom, though its impact in Great Britain is mitigated by the two-year backstop introduced by the Deduction from Wages (Limitation) Regulations 2014. In Northern Ireland, where no such backstop exists, claims may extend back to the commencement of the Working Time Regulations in 1998. The ruling clarifies that the protective purpose of the legislation, designed to protect potentially vulnerable workers from being paid too little, must be given proper effect through the series extension. The decision also confirms that the principle of equivalence can require importing procedural advantages from domestic law claims into the enforcement of EU-derived rights, even where the claimant is excluded from the domestic regime’s personal scope.

Verdict: Appeal dismissed. The Supreme Court upheld the Court of Appeal’s conclusions that police officers could rely on the series extension through the EU principle of equivalence, and that underpayments of holiday pay constituted a series not broken by gaps exceeding three months or by intervening lawful payments.

Source: Chief Constable of the Police Service of Northern Ireland & Anor v Agnew & Ors (Northern Ireland) [2023] UKSC 33