By the case of Hughes v Metropolitan Railway Co the doctrine of Promissory Estoppel was establish and the derivation of modern doctrine of it is to be found in the The doctrine of Promissory Estoppel was first developed but was lost for some time until it was resurrected by Lord Denning in the leading case of Central London Property Trust Ltd v High Trees House Ltd.
There are three exceptions to the rule in Pinnel's case. They are composite agreement, payment of debt by third party and promissory estoppel. The rule in Pinnel's case (1602) 5 CoRep117a is that part payment of debt is not good consideration to forgo the balance. Thus the creditor may sue for the remaining debt unless there is fresh consideration.
Promissory estoppel like proprietary estoppel is popular types of equitable estoppel. The importance of equitable estoppel was stated in Crabb V. Arun DC (1976) 1 Ch 179 that “equity comes in........ to mitigate the rigours of strict law.......... it prevents a person from insisting on his strict legal rights.... when it would be inequitable for him to do so having regards to the dealings which has taken place between the parties”.
An example of promissory estoppel is where A promises B that he would not enforce his legal rights and B acted and relied on it without giving any consideration, equity would not allow A to renege on his promise to B.
The modern concept of promissory estoppel was developed in the cases of Central London Property trust Ltd V. High Tree House Ltd. (1974)1 KB 130 and Total Metal Manufacturing Ltd V. Tungsten Electric Co Ltd. (1955) 1 WLR 761. Law Essay Marking
Promissory estoppel differs from common law estoppel because it has less strict requirements and it may arise from promise of future conduct or intention. Promissory estoppel is traceable to Hughes V. Metropolitan Railway (1877)2 App Case 439. Here the landlord gave his tenant 6 months to repair the property else risk forfeiture. Within the 6 months, negotiation for the sale of the lease was opened between landlord and tenant. The negotiation failed after 6 months and the tenant failed to repair. The landlord sought to enforce forfeiture. It was held that the landlord had led the tenant by his conduct to believe that the landlord would not enforce forfeiture.
In High Tree House Ltd case, the landlord promised to receive from the tenant half of the ground rent because of the difficulty of finding tenants during wartime period. After the war, the flats became occupied and the landlord sued for outstanding arrears during the wartime. The court evolving the principle of promissory estoppel held that the landlord was not entitled to the arrears rent of the wartime period.
Promissory estoppel occurs when there is a contractual relationship between parties. Like when there is a legal relationship between the promisee and the promisor. It remains unsettled whether promissory estoppel may arise in pre-contractual relationships. However, Lord Denning in Brinkom Investments Ltd V. Carr (1979)CA was of the view that promissory estoppel may arise from promise made by parties negotiating contracts. Similar views was expressed in Durham Fancy Goods V. Michael Jackson (1969) 2 QB 839 where Donaldson J. held that contractual relationship is irrelevant provided that there is “a pre-existing legal relationship which could, in certain circumstances, give rise to liabilities and penalties”.
The first requirement of promissory estoppel is that the promisor must give clear and unambiguous statement that he does not intend to enforce his legal rights. The promise may be express or implied.
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The second requirement is that promisee must have acted on that promise made by the promisor. Promissory estoppel often arise where promisee in reliance on that promise suffered detriment as in Ajayi V. Briscoe (1964) 1 WLR 1326; or where he alters his position as a result of relying on that promise when...
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