# Duress and undue influence

> **Key takeaway:** Duress: illegitimate pressure + causation + no practical alternative (Universe Tankships; DSND). Lawful-act duress narrow (Times Travel). Undue influence: actual or presumed; Etridge for banks/sureties. Remedy: rescission (bars apply).

- **Jurisdiction:** England & Wales
- **Practice area:** Commercial
- **Last reviewed:** 2026-08-04
- **Interactive page:** https://kttclegal.info/library/notes/Commercial/duress-and-undue-influence
- **Keywords:** duress, economic duress, undue influence, Etridge, Times Travel, rescission, illegitimate pressure, surety

## What is this about?

Consent to a contract may be vitiated by illegitimate pressure (duress) or by abuse of influence in a relationship of trust (undue influence). Successful claims typically render the contract voidable, subject to bars such as affirmation and delay. Economic duress is the workhorse doctrine in commercial renegotiation disputes.

## What is the core rule?

Duress requires illegitimate pressure that causes the claimant to enter the contract (or variation), leaving no practical alternative — pressure may be to the person, goods, or economic interests (Universe Tankships; DSND Subsea; Times Travel). Undue influence may be actual (overt pressure) or presumed from a relationship of influence plus a transaction calling for explanation, shifting an evidential burden (Royal Bank of Scotland v Etridge (No 2)). Remedies centre on rescission; independent advice is often decisive in bank/surety cases.

## What are the elements or test?

1. Duress: what pressure was applied; was it illegitimate (crime, tort, or illegitimate threat to breach in context); did it cause the decision; practical alternatives?
2. Distinguish hard commercial bargaining from illegitimate economic duress
3. Undue influence: actual pressure, or presumed (protected relationship or proven influence + transaction calling for explanation)?
4. Has the presumption been rebutted (typically fully informed independent advice)?
5. Bars to rescission: affirmation, delay, impossibility of counter-restitution, third-party rights

## Which authorities matter?

- **Universe Tankships Inc of Monrovia v International Transport Workers Federation (The Universe Sentinel) [1983] 1 AC 366** — Leading modern framework for economic duress: illegitimate pressure causing the contract.
- **DSND Subsea Ltd v Petroleum Geo-Services ASA [2000] BLR 530** — Practical guidance on illegitimate pressure, causation, and alternatives in commercial variation cases.
- **Times Travel (UK) Ltd v Pakistan International Airlines Corp [2021] UKSC 40, [2023] AC 101** — Supreme Court clarifies lawful-act economic duress: narrow availability where pressure is lawful but unconscionable in limited circumstances.
- **Royal Bank of Scotland plc v Etridge (No 2) [2001] UKHL 44, [2002] 2 AC 773** — House of Lords restatement of undue influence and the steps banks should take with non-commercial sureties.

## How does this apply in practice?

Contract variations under economic pressure often interact with consideration doctrine (Williams v Roffey). Undue influence bank cases are highly procedural (solicitor certificates). Duress to the person and goods remains available but less common in pure commercial paper disputes.

## What are common pitfalls?

- Treating any tough renegotiation as economic duress
- Ignoring Times Travel limits on lawful-act duress
- Assuming presumed undue influence arises from marriage alone without Etridge analysis
- Overlooking affirmation after the pressure has lifted

## When would a practitioner use this?

Use in challenged settlements, guarantee/mortgage surety claims, and disputed contract variations extracted under threat of breach.

## Quick reference

Duress: illegitimate pressure + causation + no practical alternative (Universe Tankships; DSND). Lawful-act duress narrow (Times Travel). Undue influence: actual or presumed; Etridge for banks/sureties. Remedy: rescission (bars apply).

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*Reference material from [KTTC Legal](https://kttclegal.info/), not legal advice. Work product supports instructing solicitors and barristers under their supervision. England & Wales.*