Hayes v Willoughby

Factual and Procedural Background

Plaintiff, a businessman who managed several software-development companies (collectively referred to here as Company A and Company B), brought an action for damages for harassment and for injunctive relief against Defendant, a former employee of Company A. After their professional relationship broke down in 2002, Defendant conducted an extensive, years-long campaign alleging that Plaintiff had engaged in fraud, embezzlement and tax evasion.

Between 2003 and 2007 Defendant sent hundreds of letters to various public authorities, including the Official Receiver, the police and a government department, pressing those allegations. Investigations by each authority found no wrongdoing. Despite being told of these conclusions, Defendant continued his correspondence and also intruded into Plaintiff’s private life by: (1) circulating confidential medical information obtained from Plaintiff’s former spouse; (2) suggesting to Plaintiff’s general practitioner that medical certificates had been forged; and (3) contacting Plaintiff’s landlord in The United States on the eve of Plaintiff’s bankruptcy.

The trial judge found the conduct amounted to harassment but dismissed Plaintiff’s claim on the basis that Defendant’s actions were protected by the statutory defence in section 1(3)(a) of the Protection from Harassment Act 1997 (“the Act”) because Defendant genuinely believed he was preventing or detecting crime. The Court of Appeal reversed, granted an injunction and remitted the matter for assessment of damages. Defendant appealed to the Supreme Court.

Legal Issues Presented

1. Under what circumstances can a defendant rely on the defence in section 1(3)(a) of the Act—that the course of conduct was pursued “for the purpose of preventing or detecting crime”—to defeat a civil claim for harassment?
2. Is the test for “purpose” under section 1(3)(a) wholly subjective, wholly objective, or does it include a requirement of rationality that falls between the two?
3. Must the prevention or detection of crime be the sole, as opposed to merely the dominant, purpose of the alleged harasser?

Arguments of the Parties

Defendant's Arguments

• The statutory defence in section 1(3)(a) is purely subjective; it is sufficient that Defendant honestly believed his conduct aimed to prevent or detect crime.
• Because the trial judge found Defendant’s subjective belief to be genuine throughout, the claim should remain dismissed.
• Any additional requirement of objective reasonableness or rationality would contradict the wording of the statute and render section 1(3)(c) redundant.

Plaintiff's Arguments

• The defence in section 1(3)(a) must contain some objective control mechanism; otherwise obsessive or irrational vigilantes would be immunised from liability.
• After June 2007, when official investigations had definitively refuted Defendant’s allegations, any continued pursuit was irrational and no longer connected to the purpose of preventing or detecting crime.
• The intrusions into Plaintiff’s private life demonstrated that Defendant’s predominant motive was personal animosity rather than crime prevention.

Table of Precedents Cited

Court's Reasoning and Analysis

Judge Sumption, delivering the lead judgment, held that:

• “Purpose” in section 1(3)(a) is fundamentally subjective; however, a minimal objective standard of rationality is required to prevent abuse of the defence.
• A wholly objective test would conflict with the statutory language and overlap with the separate defence of reasonableness in section 1(3)(c).
• Conversely, a wholly subjective test would permit obsessives or cranks to evade liability despite clearly oppressive behaviour.
• Rationality requires that the alleged harasser (a) thinks logically about evidence suggesting criminality and (b) forms a view that the conduct is appropriate for preventing or detecting crime. If those mental processes are absent, the defence fails.
• The trial judge’s findings showed that after June 2007 Defendant’s belief became obsessive, disconnected from evidence, and therefore irrational. Correspondence continued even after authorities refused further engagement, demonstrating no logical link to crime prevention.
• The statutory defence need only be the dominant, not the sole, purpose; however, because rationality was lacking, the court did not need to decide that point.

Judge Mance concurred, agreeing that irrational, perverse or abusive conduct exceeds the protection of section 1(3)(a). Judge Reed dissented, arguing that Parliament imposed no rationality requirement and that grafting one onto the statute undermines legal certainty, especially in criminal contexts.

Holding and Implications

APPEAL DISMISSED. The Supreme Court affirmed the Court of Appeal’s decision: Defendant is not entitled to rely on the section 1(3)(a) defence after June 2007; the injunction against further harassment remains, and the matter stands remitted for assessment of damages.

Implications: The ruling clarifies that, while the defence of preventing or detecting crime is subjective, it is limited by a requirement of basic rationality. Obsessive or illogical vigilantism will not be shielded from civil or criminal liability under the Act. The decision refines the legal landscape without establishing an entirely new cause of action but narrows the scope of an existing statutory defence.