17.—(1) Where an amendment to these Rules inserts, deletes or deletes and substitutes any entry in any Part of the First Schedule or any map in the Second Schedule, these Rules as amended shall not apply to any case where the competent authority or the Minister, as the case may be, has before the coming into operation of the amendment granted provisional permission to develop any land and the provisional permission is valid immediately prior to the coming into operation of the amendment, and these Rules shall continue to apply to such a case as if that amendment had not been made.
(2) Notwithstanding paragraph (1), in any case where the provisional permission granted to develop any land remains valid because its period has been extended by the competent authority or the Minister, as the case may be, more than once and the second or any subsequent extension comes into effect on or after the commencement of any amendments to these Rules, these Rules as in force for the time being, shall apply to that case.
(3) Where any Part of the First Schedule is re-enacted and any entry in the new Part was, immediately before the re-enactment of that Part, not specified in that Part, the re-enactment of that Part shall, for the purposes of paragraph (1), be deemed to be an amendment to these Rules that inserts that entry in that Part of the First Schedule.