Legitimate Expectation

… legitimate expectation is based not only on ensuring that legitimate expectations by the parties are not thwarted, but on a higher public interest beneficial to all including the respondents, which is, the value or the need of holding authorities to promises and practices they have made and acted on and by so doing upholding responsible public administration. This in turn enables people affected to plan their lives with a sense of certainty, trust, reasonableness and reasonable expectation. An abrupt change as was intended in this case, targeted at a particular company or industry is certainly abuse of power. Stated simply legitimate expectation arises for example where a member of the public as a result of a promise or other conduct expects that he will be treated in one way and the public body wishes to treat him or her in a different way… Public authorities must be held to their practices and promises by the courts and the only exception is where a public authority has a sufficient overriding interest to justify a departure from what has been previously promised."