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"The presumption against retrospective operation is not applicable to declaratory statutes. As stated in Craies and approved by the Supreme Court: For modern purposes a declaratory Act may be defined as an Act to remove doubts existing as to the common law, or the meaning or effect of any statute. Such Acts are usually held to be retrospective. The usual reason for passing a declaratory Act is to set aside what Parliament deems to have been a judicial error, whether in the statement of the common law or in the interpretation of statutes. Usually, if not invariably, such an Act contains a preamble, and also the word `declared' as well as the word 'enacted'. But the use of the words `it is declared' is not conclusive that the Act is declaratory for these words may, at times, be used to introduce new rules of law and the Act in the latter case will only be amending the law and will not necessarily be retrospective. In determining, therefore, the nature of the Act, regard must  be had to the substance rather than to the Corm. If a new Act is 'to explain' an earlier Act, it would be without object unless construed retrospective. An explanatory Act is generally passed to supply an obvious omission or to clear up doubts as to the meaning of the previous Act. It is well settled that if a statute is curative or merely declaratory of the previous law retrospective operation is generally intended. The language `shall be deemed always to have meant' or 'shall be deemed never to have included'' is declaratory, and is in plain terms retrospective. In the absence of clear words indicating that the amending Act is declaratory, it would not be so construed when the amended provision was clear and unambiguous. An amending Act may be purely clarificatory to clear a meaning of a provision of the principal Act which was already implicit. A clarificatory amendment of this nature will have retrospective effect and, therefore, if the principal Act was existing law when the constitution came into force, the amending Act also will be part of the existing law."

14. The presumption against retrospective operation is not applicable to declaratory statutes.... In determining, therefore, the nature of the Act, regard must be had to the substance rather than to the form. If a new Act is "to explain" an earlier Act, it would be without object unless construed retrospectively. An explanatory Act is generally passed to supply an obvious omission or to clear up doubts as to the meaning of the previous Act. It is well settled that if a statute is curative or merely declaratory of the previous law retrospective operation is generally intended.... An amending Act may be purely declaratory to clear a meaning of a provision of the principal Act which was already implicit. A clarificatory amendment of  this nature will have retrospective effect (ibid., pp. 468-69).