Section 21

When any order or direction is given under the provisions of this Part the person making the order or giving the direction shall, unless it is otherwise provided, cause notice of the effect of it to be given in such manner as he thinks necessary for bringing it to the notice of all persons who in his opinion ought to have notice of it and that order or direction shall have effect as soon as such notice has been given, without publication in the Gazette.

Any order or direction made under any provisions of this Part may at any time during its continuance be cancelled by any person empowered to make that order but without prejudice to the previous validity of the order or to anything done thereunder or to the power of such person to make a fresh order under such provision. [22