Variation of orders

(1) On any application made at a date after the expiration of the period specified in section 42 of this Act, the court may make such an order as is hereinafter mentioned, but only as respects property, the income of which is at that date applicable for the maintenance of a dependent of the testator, that is to say, (a) an order for varying a previous order on the ground that any material fact was not disclosed to the court when the order was made, or that any substantial change has taken place in the circumstances of the dependent or of a person beneficially interested under the will in the property; or (b) an order for making provision for the maintenance of another dependent of the 22 (2) An application to the court for an order under subsection (1) (a) of this section, may be made by or on behalf of a dependent of the testator or by the trustees of the property or by or on behalf of a person beneficially interested therein under the will.