Doctrine of Legitimate Expectation was first introduced in State of Kerala v. K.G. Madhavan Pillai, (1988) 4 SCC 669.
A blanket bar of Doctrine of Legitimate Expectation against a statute would cause great havoc. A blanket ban on Promissory Estoppel against a statute cannot be applicable to Doctrine of Legitimate Expectation. They are distinct. Doctrine of Promissory Estoppel is a remedy in private law. Doctrine of Legitimate Expectation is a remedy in public law and is rooted in Article 14.
To prevent contamination of ‘rule of law’, Doctrine of Legitimate Expectation becomes most important.
– Hon’ble Justice Krishna Murari, M/s. K.B. Tea Product Pvt. Ltd. v. Commercial Tax Officer, Siliguri, [Civil Appeal No. 2297 of 2011].