The Federal Court in Boustead also said this: “Thus far we have dealt with the operation of the doctrine in the context of there having been offered some active encouragement by the party sought to be estopped. But we do not apprehend the law to be different when the encouragement comes in the form of silence. The true principle in such cases is to be found in the following passage in the judgment of Thesiger LJ in De Bussche v Alt (1878) 8 Ch D 286 at p 314: If a person having a right, and seeing another person about to commit, or in the course of committing an act infringing upon that right, stands by in such a manner as really to induce the person committing the act, and who might otherwise have abstained from it, to believe that he assents to its being committed, he cannot afterwards be heard to complain of the act. In MAA Holdings Sdn Bhd & Anor v Ng Siew Wah & Ors [1986] 1 MLJ 170, VC George J (now JCA) was faced with a case where the defendant had remained silent while the purchaser had paid moneys to him. Of the defendant‟s silence, that learned judge said at p 176: Having silently stood by and allowed the purchasers to find and pay the balance of the purchase price and then wait for another 38 days before insisting on compliance of the requirement to apply to the FIC although 18 the parties had expressly agreed that whether the FIC approval was obtained or not was not to have any effect on the contract is I think the height of inequity. Robert Goff J stated the principle of this aspect of equitable estoppels in Societe Italo-Beige v Palm Oils [1982] 1 All ER 19 at pp 26-27 thus: „The fundamental principle is that stated by Lord Cairns LC, viz, that the representor will not be allowed to enforce his rights where it would be inequitable having regard to the dealings which have thus taken place between the parties. To establish such inequity, it is not necessary to show detriment; indeed, the representee may have benefited from the representation and yet it may be inequitable, at least without reasonable notice, for the representor to enforce his legal rights. Take the facts of Central London Property Trust Ltd v High Trees House Ltd [1947] KB 130; [1956] 1 All ER 256, the case in which Denning J breathed new life into the doctrine of equitable estoppels. The representation was by a lessor to the effect that he would be content to accept a reduced rent. In such a case, although the lessee has benefited from the reduction in rent, it may well be inequitable for the lessor to insist on his legal right to the unpaid rent, because the lessee has conducted his affairs on the basis that he would only have to pay rent at the lower rate; and a court might well think it right to conclude that only after reasonable notice could the lessor return to charging rent at the higher rate specified in the lease. Furthermore it would be open to the court, in any particular case, to infer from the 19 circumstances of the case that the representee must have conducted his affairs in such a way that it would be inequitable for the representor to enforce his rights, or to do so without reasonable notice.‟ Lord Denning in WJ Alan & Co Ltd v El Nasr Export and Import Co [1972] 2 QB 189 said: „If one party by his conduct, leads another to believe that the strict rights arising under the contract will not be insisted upon, intending that the other should act on that belief, and he does act on it, then the first party will not afterwards be allowed to insist on strict legal rights when it would be inequitable for him to do so.”