3.—For the avoidance of doubts it is hereby declared that—

(a) the powers conferred by this Act on a State authority in relation to State land are in addition to, and not in substitution for, any powers exercisable by that State authority in relation to that State land under any previous enactment and such last-mentioned powers shall continue to be exercisable accordingly,

(b) nothing contained in any previous enactment relating to State land shall be construed as limiting the powers conferred by this Act in relation to that State land.