Civil Law and Unlawful Means Tort

1. Introduction

The tort of unlawful means is a civil wrong concerned with intentional interference with another person's economic interests through unlawful conduct directed toward a third party.

It is particularly relevant to:

Commercial competition

Business disputes

Interference with contracts

Economic pressure

Coordinated commercial misconduct

Threats or unlawful acts against third parties

Deliberate disruption of another person's business

The modern English law of unlawful means tort has developed through a relatively narrow group of cases. Courts have emphasized that ordinary competition or aggressive commercial conduct is not automatically unlawful means.

2. Meaning

In simplified terms, unlawful means tort may arise where:

A deliberately uses unlawful conduct against a third party with the purpose of causing economic harm to the claimant, and the conduct causes the claimant economic loss.

The important feature is the three-party structure:

Defendant → unlawful conduct → Third party → economic harm → Claimant

For example:

A deliberately induces a supplier to breach its legal obligations toward B by using unlawful threats, intending to damage B's business.

The claimant may potentially have an unlawful-means claim, depending on the precise nature of the conduct and the applicable legal requirements.

3. Historical Development

The tort developed from older economic torts, particularly:

Conspiracy

Interference with contractual relations

Intimidation

Causing loss by unlawful means

Its boundaries have historically been uncertain.

Modern courts have attempted to clarify:

What counts as "unlawful means";

Whether the unlawful conduct must be actionable by the third party;

Whether the defendant must intend the claimant's economic harm;

Whether interference with a third party's freedom of action is necessary.

4. Core Elements

A claimant generally needs to establish the following:

1. Defendant used unlawful means

There must be conduct that is independently unlawful in an appropriate sense.

2. Conduct was directed toward a third party

The unlawful conduct normally concerns someone other than the claimant.

3. Defendant intended to cause economic harm

Intention is a particularly important requirement.

4. Conduct interfered with the third party's freedom of action

The modern formulation gives significant importance to interference with the third party's ability to deal with the claimant.

5. Economic loss resulted

The claimant must ordinarily establish loss caused by the unlawful conduct.

5. What Are "Unlawful Means"?

The phrase is not unlimited.

Potential examples can include:

Fraud

Certain forms of intimidation

Breach of statutory duties where legally relevant

Certain actionable wrongs against third parties

Unlawful interference with another person's property or contractual rights

Other independently unlawful conduct recognized by the applicable law

However, mere unfairness is not necessarily unlawful means.

Likewise, conduct does not become unlawful merely because it damages a competitor.

6. Intention

Intention is central.

The claimant generally must demonstrate that the defendant intended the relevant economic harm, rather than merely foreseeing that harm as a possible consequence.

There is an important distinction:

Knowledge/foresight

The defendant knows that its conduct might damage another business.

Intention

The defendant acts with the purpose of causing the economic harm.

The latter is much more significant in unlawful-means cases.

7. Economic Loss

The tort is principally concerned with economic interests.

Loss may include:

Lost profits

Loss of customers

Loss of contracts

Loss of business opportunities

Reduced commercial revenue

Loss resulting from disruption of business operations

The claimant must establish a sufficient causal connection between the unlawful conduct and the loss.

8. Unlawful Means and Competition

Competition itself is lawful.

A competitor may generally:

Reduce prices

Advertise

Improve products

Attract customers

Negotiate with suppliers

Hire employees

Introduce competing products

The problem arises where competition crosses into independently unlawful conduct intended to cause economic harm.

Therefore:

Aggressive competition ≠ unlawful means automatically.

9. Leading Case Law

1. Allen v Flood [1898] AC 1

This is a foundational case concerning economic torts.

A trade-union official successfully intervened in circumstances that resulted in workers losing employment opportunities.

The House of Lords considered whether lawful conduct could become tortious merely because it was motivated by hostility or an intention to cause harm.

Principle

A person generally does not commit a tort merely because they act with an improper motive where the underlying conduct itself is lawful.

Importance

The case demonstrates the distinction between:

Bad motive, and

Unlawful conduct.

Motive alone does not generally convert lawful conduct into a tort.

10. Quinn v Leathem [1901] AC 495

This is one of the leading authorities on unlawful interference with economic interests.

A group engaged in conduct designed to pressure employers and interfere with the claimant's business.

The House of Lords recognized liability arising from deliberate interference involving unlawful conduct.

Principle

Intentional interference with another's business through unlawful means can give rise to tortious liability.

Importance

The case is historically significant in the development of:

Economic torts

Conspiracy

Trade disputes

Unlawful interference

11. OBG Ltd v Allan [2007] UKHL 21

This is one of the most important modern authorities.

The House of Lords considered several economic torts and substantially clarified the distinction between:

Inducing breach of contract;

Causing loss by unlawful means;

Other economic torts.

Principle

The House of Lords emphasized that unlawful-means liability requires a sufficiently direct interference with the third party's freedom to deal with the claimant.

The decision significantly narrowed and clarified the scope of the tort.

Importance

It remains a central authority for understanding the modern structure of unlawful-means tort.

12. Total Network SL v Revenue and Customs Commissioners [2008] UKHL 19

The House of Lords considered economic tort principles in the context of arrangements involving unlawful conduct and tax-related transactions.

Principle

The case illustrates that the economic torts cannot be treated as unlimited causes of action whenever unlawful conduct produces economic consequences.

The precise elements of the particular economic tort must be satisfied.

Importance

It demonstrates the importance of identifying:

The particular unlawful conduct;

The relationship between parties;

Intention;

Causation;

The precise economic tort relied upon.

13. Revenue and Customs Commissioners v Total Network SL [2008] UKHL 19

This authority is also important for understanding the interaction between unlawful conduct and economic tort principles.

The House of Lords considered whether participation in an unlawful arrangement could support civil liability under economic tort principles.

Principle

Courts must carefully distinguish between:

The existence of unlawful conduct; and

Whether that conduct satisfies the elements of the particular tort being pleaded.

Importance

The case reinforces that illegality and economic tort liability are related but not identical concepts.

14. Secretary of State for Health v Servier Laboratories Ltd [2021] UKSC 24

This Supreme Court decision is highly relevant to modern economic tort analysis.

The dispute involved competition-related conduct and the scope of the unlawful-means tort.

The Supreme Court considered the meaning of unlawful means and the requirement that the defendant's conduct interfere with a third party's freedom to deal with the claimant.

Principle

The tort remains relatively narrow and should not be extended simply because unlawful conduct produces economic consequences.

Importance

The case provides modern guidance on the boundaries of unlawful means in commercial disputes.

15. Douglas and Others v Hello! Ltd [2005] EWCA Civ 595

The case involved publication and privacy-related disputes concerning photographs.

Although it primarily concerned privacy and confidence, the litigation is useful for understanding the boundaries between different civil wrongs involving commercial interests.

Principle

A claimant should identify the precise cause of action and cannot assume that every economic consequence of wrongful conduct creates liability under the unlawful-means tort.

16. Tarleton v McGawley (1793) Peake 270

This early case concerned interference with commercial dealings.

A defendant interfered with another trader's commercial opportunity by wrongful conduct directed toward the third party.

Principle

Direct interference with another trader's business through wrongful conduct can constitute a civil wrong.

Importance

The case is historically important in the development of economic interference doctrines.

17. Elements in a Simple Table

18. Relationship with Other Economic Torts

A. Unlawful Means vs Inducing Breach of Contract

Inducing breach

The defendant intentionally causes a third party to breach a contract with the claimant.

Unlawful means

The defendant uses unlawful conduct involving a third party to interfere with the claimant's economic interests.

They overlap but are not identical.

B. Unlawful Means vs Conspiracy

Conspiracy

Two or more persons combine to cause harm through unlawful means or, in some circumstances, through lawful means where the predominant purpose is to injure the claimant.

Unlawful means tort

The emphasis is on the defendant's use of unlawful conduct and interference with the claimant's economic interests.

19. Unlawful Means vs Intimidation

Intimidation generally involves unlawful threats designed to compel another person to act or refrain from acting.

Unlawful-means tort is broader in structure but has its own specific requirements.

20. Unlawful Means vs Passing Off

Passing off protects business goodwill against misrepresentation.

Unlawful-means tort protects against certain forms of deliberate economic interference.

Therefore:

Passing off → goodwill and misrepresentation

Unlawful means → deliberate economic interference through unlawful conduct

21. Causation

Causation is essential.

The claimant must demonstrate that:

Unlawful conduct → interference → economic loss

The court may ask:

What exactly did the defendant do?

Who was the third party?

What legal right or freedom of action was affected?

Was the conduct a factual cause of the loss?

Was the loss legally attributable to the conduct?

22. Defences

Depending upon the jurisdiction and facts, possible defences include:

1. Lawful Conduct

If the defendant's conduct was lawful, the unlawful-means element may fail.

2. Lack of Intention

Mere knowledge or foreseeability may not satisfy the necessary intention.

3. No Relevant Unlawful Means

The claimant must identify conduct that legally qualifies as unlawful means.

4. Lack of Causation

The claimant must connect the conduct to the economic loss.

5. No Recognizable Loss

A speculative commercial expectation may not be sufficient.

6. Justification

In some economic tort contexts, justification may be relevant, depending on the precise cause of action.

23. Remedies

Where liability is established, possible remedies include:

1. Damages

The primary remedy is normally damages for proven economic loss.

Damages may include:

Lost profits

Lost business

Loss of contractual opportunities

Other consequential economic losses

2. Injunction

An injunction may prevent continuing unlawful conduct.

For example, the court may restrain continuing interference with business relationships where the legal requirements for injunctive relief are satisfied.

3. Declaratory Relief

The court may declare the legal rights and obligations of the parties.

4. Interim Injunction

Where immediate harm is threatened, interim relief may be sought before final trial, subject to the applicable procedural requirements.

24. Evidence in Unlawful Means Claims

Evidence is particularly important because intention is often difficult to prove directly.

Relevant evidence may include:

Emails

Text messages

Internal business communications

Contracts

Supplier correspondence

Customer communications

Board minutes

Commercial records

Pricing documents

Witness evidence

Financial records

Evidence of threats or inducements

Courts may infer intention from surrounding circumstances, although the legal test remains specific to the particular tort.

25. Commercial Examples

Example 1 — Supplier Interference

A deliberately threatens B's supplier with unlawful consequences unless the supplier stops supplying B.

If the relevant requirements are satisfied, B may potentially have an unlawful-means claim.

Example 2 — Competitor Fraud

A competitor uses fraudulent representations to induce a third party to stop dealing with B.

The fraudulent conduct may constitute unlawful means if the other elements of the tort are established.

Example 3 — Ordinary Price Competition

A reduces prices to attract B's customers.

This is ordinarily lawful competition, even though B loses customers.

Example 4 — Lawful Negotiation

A persuades a supplier to offer better terms.

The fact that B suffers commercially does not by itself establish unlawful means.

26. Importance in Modern Commercial Law

The tort has particular relevance to:

Competition disputes

Business-to-business conflicts

Supplier relationships

Distribution networks

Commercial negotiations

Trade disputes

Platform businesses

Intellectual-property-related interference

Corporate rivalry

Strategic litigation

Modern courts nevertheless approach the tort cautiously because an excessively broad definition could turn ordinary competition into civil liability.

27. Case Law Revision Table

28. Key Distinction: Lawful vs Unlawful Competition

The important principle is:

Economic harm to a competitor is not itself enough. The claimant must establish the specific requirements of the unlawful-means tort.

29. Exam-Oriented Analysis

When answering an unlawful-means tort problem, use the following sequence:

Step 1 — Identify the economic interest

What business, contract, customer relationship or commercial opportunity was affected?

Step 2 — Identify the third party

Who was subjected to the defendant's conduct?

Step 3 — Identify the unlawful act

What precisely was unlawful?

Step 4 — Establish intention

Was the defendant intending the relevant economic harm?

Step 5 — Establish interference

Did the conduct interfere with the third party's freedom to deal with the claimant?

Step 6 — Establish causation

Did that conduct cause the claimant's loss?

Step 7 — Consider defences

Was the conduct lawful? Was there insufficient intention? Is the loss too remote or speculative?

Step 8 — Select remedy

Consider damages, injunction and declaratory relief.

30. Quick Revision Formula

Unlawful Means Tort =

Unlawful Conduct + Third-Party Interference + Required Intention + Causation + Economic Loss

Remember:

Unlawful conduct matters

Third-party involvement matters

Intention matters

Economic loss matters

Ordinary competition is not automatically unlawful

OBG v Allan is a key modern authority

Servier is important for modern boundaries

Damages are the principal remedy

Injunctions may prevent continuing interference

Conclusion

The unlawful means tort protects economic interests against certain forms of deliberate and legally wrongful interference. Its modern scope is relatively controlled: the claimant must identify the specific unlawful conduct, demonstrate the required intentional interference involving a third party, establish causation and economic loss, and overcome any applicable defences.

The most important authorities for revision are Allen v Flood, Quinn v Leathem, OBG Ltd v Allan, Total Network v HMRC, and Secretary of State for Health v Servier Laboratories.