“… their Lordships consider that when a question like the present one arises - an alleged failure to comply with a time provision - it is simpler and better to avoid these two words ‘mandatory’ and ‘directory’ and to ask two questions. The first is whether the legislature intended the person making the determination to comply with the time provision, whether a fixed time or a reasonable time. Secondly, if so, did the legislature intend that a failure to comply with such a time provision would deprive the decision maker of jurisdiction and render any decision which he purported to make null and void?” “Whether non-compliance with a procedural requirement is fatal turns less on attaching a perhaps indefinite label to that requirement than on considering its place in the scheme of the Act or regulations and the degree and seriousness of the non-compliance.”
“Still, whatever the language, the idea is a perfectly distinct one. There may be many provisions in Acts of Parliament which, although they are not strictly obeyed, yet do not appear to the Court to be of that material importance to the subject-matter to which they refer, as that the legislature could have intended that the non-observance of them should be followed by a total failure of the whole proceedings. On the other hand, there are some provisions in respect of which the Court would take an opposite view, and would feel that they are matters which must be strictly obeyed, otherwise the whole proceedings that subsequently follow must come to an end.” “… in each case you must look to the subject-matter; consider the importance of the provision that has been disregarded, and the relation of that provision to the general object intended to be secured by the Act; and upon a review of the case in that aspect decide whether the matter is what is called imperative or only directory.”
“At one end of this spectrum there may be cases in which a fundamental obligation may have been so outrageously and flagrantly ignored or defied that the subject may safely ignore what has been done and treat it as having no legal consequences upon himself. In such a case if the defaulting authority seeks to rely on its action it may be that the subject is entitled to use the defect in procedure simply as a shield or defence without having taken any positive action of his own. At the other end of the spectrum the defect in procedure may be so nugatory or trivial that the authority can safely proceed without remedial action, confident that, if the subject is so misguided as to rely on the fault, the courts will decline to listen to his complaint.”