How Hayes v Willoughby (2013) Helps Good-Faith Complainants

Hayes v Willoughby [2013] UKSC 17 is one of the key UK Supreme Court decisions on the Protection from Harassment Act 1997. On the surface, it looks like a case about a man who said he was trying to “detect crime”. In reality, it is about what happens when that claim turns into an obsessive personal vendetta.

For people who challenge institutions, regulators or employers, this judgment can feel unnerving at first sight. The defendant was saying, “I am just trying to expose wrongdoing.” The court still found harassment. It raises an obvious fear: does this mean my complaints could be called harassment too?

Properly understood, the answer is: no, not if you stay within rational, good faith, evidence based channels. The case actually sets a limit on people who weaponise “crime prevention” as a cover for irrational campaigns.

Read together with R v Curtis (2010): Weaponising Harassment Allegations, you can see the law cutting both ways. Curtis shows how harassment allegations can be used to shut people up in the criminal courts. Hayes shows how “crime prevention” language can be misused to excuse a civil campaign that has long since stopped being rational. Neither case is aimed at ordinary people using legal rights in a structured and proportionate way.

Quick recap: the legal background

Section 1(1) of the Protection from Harassment Act 1997 says a person:

“must not pursue a course of conduct (a) which amounts to harassment of another, and (b) which he knows or ought to know amounts to harassment of the other.”

Harassment is both a criminal offence (section 2) and a civil wrong (section 3). Section 7(2) clarifies that:

“references to harassing a person include alarming the person or causing the person distress”.

The Supreme Court in Hayes v Willoughby adopted an ordinary language meaning: “a persistent and deliberate course of unreasonable and oppressive conduct, targeted at another person, which is calculated to and does cause that person alarm, fear or distress.”

Our earlier piece, The Protection from Harassment Act 1997: A Legal Lifeline for the Powerless, shows how the Act can protect people who are being shut down and silenced by institutions. R v Curtis (2010) shows how harassment language can be pushed in the other direction in criminal proceedings. Hayes v Willoughby sits alongside those as a case about when the person claiming to “prevent crime” becomes the harasser.

What actually happened in Hayes v Willoughby?

Mr Hayes ran a group of software companies. Mr Willoughby had worked for one of them. After a major fall out, Willoughby became convinced that Hayes had committed fraud, embezzlement and tax evasion.

He then launched a long running campaign, including:

• sending very large volumes of letters to the Official Receiver, the police, the Department of Trade and Industry and other bodies. The Official Receiver alone estimated around 400 communications on the matter,
• pressing allegations of serious criminality even after formal investigations had found no evidence to support them and had told him so in increasingly strong terms,
• continuing in the same way even after, in the judge’s words, “most of the relevant bodies are refusing to have any more to do with him” because when one allegation was conclusively refuted, he would simply change ground and put forward another with equal force,
• digging into Hayes’s private life in what the trial judge described as “unacceptable intrusions into Mr Hayes’s privacy and personal affairs”.

Those intrusions are worth spelling out, because they show how far this went beyond normal complaint behaviour. Willoughby:

• went to Hayes’s ex wife for confidential information from their divorce about his mental and emotional health, then passed it to third parties to generate prejudice against him,
• contacted Hayes’s GP and suggested Hayes had forged sick notes used in court proceedings,
• phoned Hayes’s landlord in the United States the day before his bankruptcy, warning that Hayes was about to go bankrupt and asking whether he owed the landlord money.

The trial judge found that all of this formed a course of conduct calculated to cause, and actually causing, alarm, distress and anxiety. That part was not challenged on appeal, it was harassment.

The only live question was whether Willoughby could shelter behind a statutory defence.

The attempted defence: “I was just trying to detect crime”

Section 1(3)(a) of the PfHA creates a defence where the alleged harasser shows:

“that it was pursued for the purpose of preventing or detecting crime”.

Willoughby argued that his conduct was aimed at exposing criminal behaviour by Hayes. The trial judge accepted that, at least in his own mind, his campaign was “subjectively directed at the prevention or detection of crime” and that this had been his predominant purpose.

Crucially, however, the judge also found:

• at the start, there was a reasonable basis for suspicion,
• but once the Official Receiver and others had examined the bank statements and concluded there was nothing in it, that basis fell away,
• by mid 2007, Willoughby’s persistence had become “unreasonable and obsessive”,
• he developed an “unshakeable conviction” of Hayes’s guilt which now preceded rather than followed any objective assessment of evidence.

In short, the judge thought his mindset had tipped from suspicion based on facts into obsession driven by itself.

The Supreme Court’s key move: purpose must be at least rational

The Supreme Court agreed that the defence in section 1(3)(a) is about the defendant’s subjective purpose. It rejected a fully objective “reasonableness” test, because Parliament already provided a separate reasonableness defence in section 1(3)(c).

But it also refused to give obsessives a free pass. Lord Sumption held that some control mechanism is needed so that a person cannot simply shout “crime prevention” and then pursue an oppressive campaign forever.

That control mechanism is rationality. In the court’s words:

“Rationality is not the same as reasonableness. Reasonableness is an external, objective standard… A test of rationality, by comparison, applies a minimum objective standard to the relevant person’s mental processes. It imports a requirement of good faith, a requirement that there should be some logical connection between the evidence and the ostensible reasons for the decision, and … an absence of arbitrariness, of capriciousness or of reasoning so outrageous in its defiance of logic as to be perverse.”

The court set out a simple expectation:

“Before an alleged harasser can be said to have had the purpose of preventing or detecting crime, he must have sufficiently applied his mind to the matter. He must have thought rationally about the material suggesting the possibility of criminality and formed the view that the conduct said to constitute harassment was appropriate for the purpose of preventing or detecting it.”

If that minimum mental process is missing, if the person is just acting on obsession, or has detached from evidence entirely, then:

• they do not legally have the “crime prevention” purpose at all, and
• there is no real causal connection between that alleged purpose and the oppressive conduct.

Why Willoughby’s campaign failed the test

Applying that standard, the Supreme Court agreed with the Court of Appeal that the defence under section 1(3)(a) failed for the later period of Willoughby’s campaign.

Lord Sumption held that, read fairly, the trial judge’s findings meant that after mid 2007:

• Willoughby’s conduct was “more than objectively unreasonable, it was irrational”,
• his persistence was “obsessive”,
• his belief in Hayes’s guilt now preceded any assessment of evidence,
• he kept pressing the same allegations long after public authorities had refused to deal with him and had investigated and closed the matter.

The court concluded:

“He was proceeding with his campaign for its own sake, regardless of the prospect of detecting any crimes of Mr Hayes.”

Once his conduct had reached that point, it could no longer realistically be described as being for the purpose of preventing or detecting crime. The defence fell away. The appeal was dismissed.

How this actually protects good faith complainants

If you are someone who:

• uses formal complaints, FOI, Subject Access Requests and regulatory channels,
• engages with internal reviews and appeal routes,
• stops or changes tack once an investigation is genuinely final or moves into a new legal avenue,
• keeps your criticism grounded in documents, timelines and evidence rather than chasing people in their private lives,

then Hayes v Willoughby is not aimed at you.

It is aimed at something quite different, people whose “complaints” evolve into an irrational, obsessive campaign that carries on with the same intensity even when:

• evidence has been examined and found wanting,
• public bodies have clearly closed the case,
• the campaign spills into personal attacks, rumour spreading and unrelated intrusions, like contacting ex partners, GPs or landlords to stir up prejudice.

The Supreme Court’s rationality filter means:

• you can pursue complaints and challenge decisions, even robustly,
• you can believe strongly that something is wrong and say so,
• you can push regulators, ombudsmen and courts to look again using the procedures designed for that purpose,

but if your conduct remains anchored in evidence, process and proportionality, it is a long way from the obsessive, closed loop vendetta described in Hayes v Willoughby.

Harassment law is not a gag on criticism

It is also important to put this alongside the wider case law on harassment and free expression. In cases like Thomas v News Group Newspapers and Majrowski v Guy’s and St Thomas’ NHS Trust, the courts have recognised that harassment is about oppressive, targeted conduct, not simply about speech that people dislike.

In R v Curtis, harassment law was used inside the criminal courts in a way that raises serious questions about overreach and the chilling of legitimate speech. In Hayes v Willoughby, the problem was the opposite, an individual using the language of “crime prevention” to keep pushing a closed issue in a way that had become irrational and oppressive.

In Hayes, the Supreme Court explicitly recognised the risk that some people, including activists, may genuinely believe they are “preventing crime”, even when their view of what counts as a crime is wrong. That is precisely why the court insisted on the rationality control:

“It cannot be the case that the mere existence of a belief, however absurd, in the mind of the harasser that he is detecting or preventing a possibly non existent crime, will justify him in persisting in a course of conduct which the law characterises as oppressive.”

In other words, harassment law is not supposed to shut down good faith criticism. It is meant to stop people using “crime” as a flag to excuse behaviour that, in reality, has become oppressive on its own terms.

Practical takeaways if you are worried about being accused of harassment

From a rights based perspective, Hayes v Willoughby suggests a few simple safeguards:

• Stay evidence driven. Keep your complaints grounded in documents, dates, policies and specific decisions. Update your view if new evidence genuinely undercuts your earlier position.
• Use official channels. Follow internal complaints procedures, statutory regulators, ombudsmen, tribunals and courts. The more you use structured processes, the further you are from an unstructured “campaign”.
• Respect finality, but define it properly. Once a regulator has reached a final decision and there is no further appeal, continuing to bombard the same body with the same allegations is risky. Moving to a new, lawful avenue (for example judicial review, a tribunal, another competent regulator) is different from refusing to accept any outcome at all.
• Avoid personal intrusion. Focus on conduct, policy and institutional decisions. Do not dig into private medical history, family relationships or housing situations unless they are genuinely relevant and handled through proper legal routes.
• Check your own loop. If you find yourself repeating allegations with the same intensity after multiple independent bodies have rejected them on the evidence, ask whether your belief is now running ahead of the facts. Hayes v Willoughby is essentially about that moment.

Follow those basic principles, and you are operating in the space the PfHA was originally designed to protect, the space where vulnerable people use the law to resist oppressive behaviour, not the space where someone uses the language of “crime prevention” to justify a personal vendetta.

This article is for general information only and is not legal advice. If you are facing allegations of harassment, or believe you are being harassed for asserting your rights, you should seek independent legal advice tailored to your situation.