Introduction
The decision in O’Reilly v Mackman [1983] 2 AC 237 established a strict rule of procedural exclusivity in English public law. Claimants seeking to challenge decisions of public bodies were required to proceed by way of judicial review under the former Rules of the Supreme Court, Order 53, rather than by ordinary writ or originating summons. This principle was intended to protect public authorities from unwarranted litigation through the imposition of strict time limits, the need for permission, and other procedural safeguards. Yet the exclusivity rule has generated persistent uncertainty for litigants attempting to frame claims. The boundary between public and private law rights has proved difficult to draw, leading to satellite litigation over procedural choice and occasional injustice where claimants have selected the wrong route. This essay examines the origins of the principle, identifies the sources of uncertainty it created, and evaluates judicial and legislative responses that have sought to moderate its rigour.
The Principle Established in O’Reilly v Mackman
In O’Reilly, prisoners challenged disciplinary awards made by the Board of Visitors. Rather than seeking judicial review, they issued writs alleging breaches of natural justice. The House of Lords held that the claims were matters of public law and therefore had to be brought exclusively by judicial review. Lord Diplock emphasised that the procedural protections built into Order 53 were designed to prevent abuse of process and to safeguard the administration of public bodies. The decision thus created a clear procedural fork: what was characterised as a public law claim could not be pursued by ordinary action, even where private law remedies such as damages or declarations might otherwise have been available. While the ruling achieved a degree of procedural discipline, it immediately raised questions about the criteria for determining whether a dispute was truly one of public law.
Sources of Uncertainty for Claimants
The exclusivity principle obliged courts and litigants to classify disputes according to a public-private divide that has never been sharply delineated. Hybrid cases, where public law issues are intertwined with contractual or tortious claims, have proved especially problematic. In such circumstances a claimant may be uncertain whether an ordinary action is permissible or whether the claim will be struck out for abuse of process. Furthermore, the strict three-month time limit applicable to judicial review applications (now contained in CPR r 54.5) contrasts sharply with the longer limitation periods for private law actions. A claimant who reasonably but mistakenly commences ordinary proceedings may find that the judicial review route is time-barred by the time the procedural objection is raised. This risk has created a chilling effect, encouraging cautious litigants to commence judicial review even where ordinary proceedings might ultimately prove more advantageous. The resulting satellite litigation over procedure adds cost and delay, undermining the very efficiency the exclusivity rule was designed to promote.
Judicial Attempts to Mitigate Rigidity
Subsequent case law has introduced qualifications that have softened, yet simultaneously complicated, the original principle. In Roy v Kensington and Chelsea and Westminster Family Practitioner Committee [1992] 1 AC 624 the House of Lords permitted a doctor to pursue a private law claim for fees even though the underlying dispute involved a public law decision. Their Lordships held that a collateral challenge to a public law act could be mounted in ordinary proceedings where private law rights were directly in issue. Later, in Clark v University of Lincolnshire and Humberside [2000] 1 WLR 1988, the Court of Appeal confirmed that the exclusivity rule would not apply automatically where the claim could fairly be characterised as one involving private law rights. These decisions reflect judicial recognition that rigid adherence to O’Reilly could produce injustice. However, the variable application of exceptions has itself become a source of uncertainty; claimants must now assess, often without clear predictive guidance, whether their claim falls within or outside the public law sphere. The case-by-case approach, while flexible, leaves the boundary between the two procedural regimes imprecise.
Legislative and Procedural Developments
The introduction of the Civil Procedure Rules in 1999 and the subsequent codification of judicial review procedure in CPR Part 54 have provided a more integrated framework. The courts now possess greater case-management powers to transfer proceedings between the ordinary and judicial review tracks where appropriate. Nevertheless, the permission requirement and the short time limit remain distinctive features of judicial review, preserving some of the procedural distinctions that originally prompted the exclusivity rule. Academic commentary suggests that these reforms have reduced but not eliminated the practical difficulties facing claimants who must still decide, often at an early stage and with incomplete information, which route to follow. The continuing need for careful characterisation of claims demonstrates that the legacy of O’Reilly remains influential.
Conclusion
The principle of procedural exclusivity articulated in O’Reilly v Mackman achieved an important policy objective by protecting public bodies from unmeritorious challenges. At the same time, the rule has produced enduring uncertainty for claimants required to navigate an imprecise public-private divide and to comply with stringent procedural constraints. Judicial qualifications and procedural reforms have mitigated some of the harsher consequences, yet they have also introduced new layers of complexity. The result is a regime that continues to demand careful strategic judgement from those bringing claims for judicial review, illustrating the tension between administrative efficiency and access to justice that characterises this area of law.
References
- Craig, P. (2016) UK Administrative Law. 3rd edn. Oxford: Oxford University Press.
- Elliott, M. (2021) Administrative Law. 5th edn. Oxford: Oxford University Press.
- Wade, H.W.R. and Forsyth, C.F. (2014) Administrative Law. 11th edn. Oxford: Oxford University Press.
