Case Facts
The appellant was a hire-purchaser trading under the name The Colony Carrier Co, and the respondent was R T Briscoe (Nigeria) Ltd, the owner of eleven Seddon lorries. Under two hire-purchase agreements dated 1 June 1956 and 31 July 1956, the lorries were valued at £24,511 6s 8d. After deposits were paid, a balance of £20,440 4s 2d remained, payable by instalments ending 30 January 1957. By the time proceedings were issued on 2 November 1959, £11,304 16s 0d of that balance remained unpaid.
On 12 July 1957, the hire-purchaser wrote to the owners stating that he had been compelled to withdraw the lorries from service due to servicing difficulties and that he did not wish to forfeit the sums already paid. In reply, the owners' acting manager wrote on 22 July 1957 confirming that the owners were "agreeable to your withholding instalments due on the Seddon Tippers as long as they are withdrawn from active service." Following receipt of that letter, the hire-purchaser returned eight of the eleven lorries to the owners for repairs. The remaining three lorries were not returned; they continued to lie in the hire-purchaser's own garage.
At first instance in the High Court of Lagos, the hire-purchaser's primary defence was that the owners had committed fraud in inducing him to enter into the hire-purchase agreements. That defence failed, and judgment was entered for the owners for the full outstanding sum of £11,304 16s 0d. Notably, the equitable defence of promissory estoppel was not pleaded at trial at all. It was raised for the first time as the sole ground of appeal before the Federal Supreme Court of Nigeria, which dismissed the appeal on 21 December 1962. The hire-purchaser then appealed to the Privy Council.
Held
The Privy Council dismissed the appeal. The hire-purchaser had failed to establish the equitable defence of promissory estoppel on the facts. The evidence did not prove either that the lorries had been withheld from him after repair or that he had altered his position in reliance upon the owners' letter of 22 July 1957 — whether by failing to put forward counter-proposals, by reorganising his business, or in any other way. Absent proof of detrimental reliance amounting to an alteration of position, the defence could not succeed.
The Board also declined to remit the case for a new trial. Because the promissory estoppel defence had not been expressly pleaded at trial, the relevant facts had never been investigated or tested before the trial court. In those circumstances it would not be appropriate to allow the matter to be reopened at a further hearing.
Ratio Decidendi
The Board confirmed and authoritatively restated the principle of promissory estoppel as previously stated in Hughes v Metropolitan Railway [1877] and as confirmed by the House of Lords in Tool Metal Manufacturing v Tungsten Electric [1955].
"if persons who have contractual rights against others induce by their conduct those against whom they have such rights to believe that such rights will either not be enforced, or will be kept in suspense or abeyance for some particular time, those persons will not be allowed by a court of equity to enforce the rights until such time has elapsed, without at all events placing the parties in the same position as they were before."
The Board held that the principle of promissory estoppel operates subject to three distinct qualifications:
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Alteration of position: The other party must have altered his position in reliance upon the promise. A mere promise, unaccompanied by any change in the promisee's position, is insufficient to engage the doctrine.
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Revocability on reasonable notice: The promisor may resile from the promise on giving reasonable notice to the promisee. Such notice need not be formal, but it must be sufficient to afford the promisee a reasonable opportunity of resuming his original position.
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Finality and irrevocability: The promise becomes final and irrevocable only if, and to the extent that, it would be inequitable to permit the promisor to resile — that is, where the promisee cannot resume the position he was in before the promise was made.
Because the hire-purchaser had not demonstrated that he altered his position following receipt of the letter of 22 July 1957, the first and most fundamental qualification was not satisfied. The doctrine accordingly could not shield him from liability for the outstanding instalments.
Obiter Dicta
The Board's restatement of the doctrine implicitly affirmed that promissory estoppel operates as a shield rather than a sword: it is available as a defence to an existing contractual obligation but does not create an independent cause of action. This is consistent with the approach taken in Combe v Combe [1951] and Central London Property v High Trees [1947].
The Board's observations regarding the revocability of a promissory estoppel on reasonable notice, and the conditions under which a promise becomes irrevocable, were, strictly speaking, not necessary to decide the appeal given that the hire-purchaser had failed to prove any alteration of position at all. Those observations therefore carry the character of obiter dicta, though they constitute an important and authoritative elaboration of the doctrine's boundaries for students and practitioners alike.