Where by a provisional or other order in operation immediately before the commencement of this Act any enactment repealed by this Act has been applied to a port health authority or joint board, that order may be amended by an order of the Minister applying to the authority or board, in substitution for any enactment so repealed, any corresponding enactment in this Act which the Minister could under this Act apply to an authority or board of the like kind :
Provided that, if the Minister's order is not made within two years after the commencement of this Act, and on the application of the authority or board in question, the order shall be provisional only and shall not have effect until it is confirmed by Parliament.