18. Increase in value of realisable property.
(1) This section shall have effect where the amount which a person is ordered to pay by a confiscation order is less than the amount assessed to be the value of the person's -
(a) proceeds of drug trafficking, in the case of a drug trafficking offence,
(b) funds subject to confiscation, in the case of an offence of financing terrorism, or
(c) benefit obtained from an offence other than a drug trafficking offence or an offence of financing terrorism.
(2) If, on an application made by the Director of Public Prosecutions, the High Court is satisfied that the amount ("the first amount") that might be realised in the case of the person in question is greater than the amount taken into account in making the confiscation order (whether it was greater than was thought when the order was made or has subsequently increased), the court may substitute for the first amount such amount (not exceeding the amount assessed as the value referred to in subsection (1) of this section) as appears to the court to be appropriate having regard to the amount now shown to be realisable.