8All expenses incurred by the appropriate Minister in relation to any application for an order under section 1 of this Act or to any order made in consequence thereof shall be defrayed by the applicants ; and the appropriate Minister shall, if he thinks fit, on or at any time after the making of the application, require the applicants to pay to him such sum as he thinks requisite for or on account of those expenses, or to give security to his satisfaction for the payment of those expenses on demand.