The position of the law still remains the same. It is that where by words or conduct, a party to a transaction freely makes to the other an unambiguous promise or assurance which is intended to affect the legal relations between them and the former acts upon it by altering his position to his detriment, the party making the promise of assurance will not be permitted to act inconsistently with it. This is as pronounced in Central London Property Trust Ltd. v. High Trees House Ltd. (1947) K.B. 130. It has remained good law for a long time now. I approve same without any reservation.
— J.A. Fabiyi, JSC. BFI v. Bureau PE (2012) – SC.12/2008