(1)It is hereby declared that where permission has been granted under section eighteen of the Act of 1947 for the retention on land of any buildings or works, or for the continuance of any use of land, subject to any condition or limitation,-the references in subsections (1) and (2) of section twenty-three of that Act to any conditions or limitations subject to which permission was granted in respect of any development include references to any such condition or limitation.
(2)It is hereby declared that the power conferred by subsection (1) of the said section eighteen is exercisable not only where development has been carried out without permission or where a previous permission has been granted for a limited period only, but also so as to permit the retention of buildings or works or the continuance of any use of land without complying with some condition subject to which a previous permission under Part III of the Act of 1947 was granted.
(3)It is hereby declared that where—
(a)permission is granted under Part III of the Act of 1947 for development consisting of or including the carrying out of building or other operations subject to a condition that the operations shall be commenced not later than a time specified in the condition, and
(b)any building or other operations are commenced after the time so specified,
the commencement and carrying out of those operations do not constitute development for which that permission was granted.