Unless and until such time as a specified work is licensed under section 66 of the 1968 Act (licensing of works) or removed, LUL must, at or near that work, and any other work of which LUL is in possession in exercise of any of the powers conferred by this Order (being in either case a work which is below mean high water level), exhibit such lights, lay down such buoys and take such other steps for preventing danger to navigation as the PLA may from time to time reasonably require.