The following persons may apply to the High Court to vary or discharge an order made under section 196 or 197 or to the Crown Court to vary or discharge an order made under section 198 or 199 —
the receiver;
the person who applied for the order ...;
any person affected by the order.
On an application under this section the court—
may discharge the order;
may vary the order.
But in the case of an order under section 196 or 197—
if the condition in section 189 which was satisfied was that proceedings were started or an application was made, the court must discharge the order on the conclusion of the proceedings or of the application (as the case may be);
if the condition which was satisfied was that an investigation was started or an application was to be made, the court must discharge the order if within a reasonable time proceedings for the offence are not started or the application is not made (as the case may be).