In English law, promissory estoppel prevents a party from going back on a promise, even without formal consideration, if the other party has reasonably relied on that promise to their detriment.
Promissory estoppel arises when one party clearly promises to waive or suspend certain legal rights, and the other party relies on this promise, altering their position as a result. The doctrine ensures fairness by preventing unjust or inequitable outcomes.
Promissory estoppel is typically a defensive remedy, preventing enforcement of certain rights rather than creating new obligations. It usually suspends rights temporarily rather than extinguishing them permanently.
Promissory estoppel reinforces equitable fairness in commercial dealings, encouraging honesty and preventing unfair exploitation of informal agreements.
You may find our detailed guide on estoppel helpful.
Marks & Spencer abruptly terminated a 30-year supply relationship with Baird Textiles without notice. Baird claimed an implied contract and estoppel required reasonable notice. The Court of Appeal held neither claim had real prospects of success, affirming contractual certainty requirements and that estoppel cannot create a cause of action outside property contexts.
During World War II, a landlord agreed to reduce rent on flats that became difficult to let. After the war ended, the landlord sought to recover full rent. The court held that the promise to accept reduced rent was binding during the war period, establishing the doctrine of promissory estoppel in English law.
Mr Collier, jointly liable with two partners on a judgment debt, claimed a creditor had agreed to accept only his one-third share. The Court of Appeal held no binding contract existed but set aside the statutory demand, finding a triable promissory estoppel issue.
Wife left matrimonial home with husband's consent for a holiday but did not return. Husband petitioned for divorce claiming wife's desertion revived her previously condoned adultery. Court found husband failed to prove wife intended to desert, as he kept her short of money and showed no genuine desire for her return. Appeal dismissed.
D & C Builders, a small building company in financial difficulties, were owed £482 by Rees. His wife offered £300 in full settlement, threatening they would receive nothing otherwise. The Court of Appeal held the payment did not discharge the debt as there was no consideration and the agreement was obtained through intimidation.
A landlord served a six-month notice to repair on his tenant railway company. During negotiations for the sale of the lease, repairs were suspended by mutual understanding. The House of Lords held the landlord could not enforce forfeiture when repairs were completed within six months of negotiations ending, establishing the equitable principle that parties cannot enforce strict legal rights after inducing the other party to believe those rights would not be enforced.
Miss Marnell repeatedly declared she had abandoned a £1200 bond debt owed by William Money, and his marriage proceeded on this faith. After her own marriage, she sought to enforce the bond. The House of Lords held that a representation of intention is not the same as a misrepresentation of fact, and cannot ground an estoppel.
Selectmove Ltd owed substantial PAYE and NIC arrears to the Inland Revenue. The company's director claimed an agreement was made with a tax collector to pay arrears by instalments. The Court of Appeal held there was no binding agreement due to lack of authority and consideration, reaffirming that practical benefits cannot constitute consideration for payment of existing debts under Foakes v Beer.
T.M.M.C. granted TECO a patent licence requiring royalty and 'compensation' payments for exceeding production quotas. During wartime, T.M.M.C. informally suspended compensation claims. The House of Lords held that delivery of a counterclaim in earlier litigation sufficiently terminated this equitable suspension, allowing T.M.M.C. to recover compensation after reasonable notice.
Kenyan coffee sellers contracted with Tanzanian buyers for payment in Kenyan shillings. A letter of credit was issued in sterling, which the sellers accepted and used for payment. After sterling devaluation, sellers claimed the difference. The Court held that by accepting the sterling credit, sellers had waived their right to payment in Kenyan currency.
September 3, 2026
National Case Law Archive
September 3, 2026
National Case Law Archive
September 3, 2026
National Case Law Archive