Any byelaws made by a local authority for any of the purposes mentioned in paragraph 9 of Schedule 5 to this Act which immediately before the commencement of this Act were in force by virtue of sub-paragraph (2) of paragraph 5 of Schedule 6 to the 1963 Act shall notwithstanding the repeal by this Act of that sub-paragraph continue in force by virtue of this paragraph; and any authority which immediately before the commencement of this Act had power to revoke any such byelaws to any extent shall continue to have that power.