A direction under section 31U has binding effect from the time it is made until the witness in relation to whom it applies is discharged.
But the court may revoke a direction under section 31U before the witness is discharged, if it appears to the court to be in the interests of justice to do so, either—
on an application made by a party to the proceedings, or
of its own motion.
The court may revoke a direction under section 31U on an application made by a party to the proceedings only if there has been a material change of circumstances since—
the direction was given, or
if a previous application has been made by a party to the proceedings, the application (or the last application) was determined.
The court must state its reasons for—
giving a direction under section 31U;
refusing an application for a direction under section 31U;
revoking a direction under section 31U;
refusing an application for the revocation of a direction under section 31U.