Jurisdiction(s):
United Kingdom

Key definition

Estoppel definition

What does Estoppel mean? In practice, estoppel prevents a party from denying or reversing a state of affairs where, by words or conduct, it induced another to rely on it, and it would be unjust to allow that party to resile. It is primarily a case-law doctrine (equitable and common-law) rather than statutory, used across contract, property and civil procedure. Core elements commonly include: a clear representation or assurance; reasonable reliance; a change of position or detriment; and unconscionability. Main forms include: - Estoppel by representation of fact (common law). - Promissory estoppel (equity): typically suspends enforcement of existing rights and is generally a defence, not a...

Estoppel in pension schemes: principles and case law on representations, reliance, and the limits of explanatory literature, group claims and administrator misstatements

Published by a LexisNexis Pensions expert

Practice notes

Development of the doctrine of Estoppel

Estoppel is the commonly used label for the equitable doctrine which holds that where one individual (A) causes another (B), whether through words or conduct and whether explicitly or by implication, to accept a particular state of affairs as true, A ought not later to resile from the representations or acts that induced B to that belief, where it would be unjust or unconscionable for A to do so. Put shortly, where A has by statement or deed led B to that belief, A should not later contradict it if doing so would be unconscionable. Over time, the doctrine has expanded beyond its initial confines, and today the courts (both in England and Wales and elsewhere) recognise and apply a range of distinct forms of estoppel to meet the needs of particular cases...

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Wyn Derbyshire

gunnercooke LLP

Wyn is a partner at gunnercooke LLP and specialises in pensions, trust and employment law in all industry sectors, dealing with the transactional, advisory and documentation aspects.He also has wide experience of the pensions implications of heavyweight corporate transactions and flotations, the issues arising from the establishment and merger of pension schemes, and sex equalisation and other discrimination issues in respect of benefits provided by pension schemes. In addition, he provides advice to pension scheme trustees generally.Recent transactions include advising Amcor on pension matters relating to the acquisition of Alcan business and the acquisition of Northern Foods PLC by Boparan Holdings.He is a co-author (with Stephen Hardy and Stephen Maffey) of TUPE: Law and Practice, published by Spiramus Press (now in its 4th edition), and co-author (with Stephen Hardy and David Wicks) of Money & Work, published by Spiramus Press in August 2007. He has also...

Web page updated on 21/05/2026

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