"In argument, the respondent did not draw any clear distinction between waiver and estoppel. Indeed, authority favours the view that, in the present context, no such distinction can in principle be drawn. 'Waiver' is an imprecise term and is used to describe what is done in a variety of circumstances rather than to assert any particular legal process. However, where it is not used in the sense of election between mutually exclusive alternatives, if it has any identifiable legal consequence, it is generally indistinguishable from estoppel. Isaacs J. made this point in a wellknown passage in Craine v. Colonial Mutual Fire Insurance Co. Ltd., where, in delivering the judgment of the Court, he used the word 'waiver' in the sense of waiver by election and said that waiver requires a distinct act done with knowledge and intention in order to see whether there has been an election. Waiver looks 'chiefly to the conduct and position of the person who is said to have waived, in order to see whether he has 'approbated' so as to prevent him from 'reprobating' in English terms, whether he has elected to get some advantage to which he would not otherwise have been entitled, so as to deny him a later election to the contrary.'