"(1)The Lord Chancellor may by regulations make provision empowering magistrates’ courts, the Crown Court and the Court of Appeal, in any case where the court is satisfied that one party to criminal proceedings has incurred costs as a result of an unnecessary or improper act or omission by, or on behalf of, another party to the proceedings, to make an order as to the payment of those costs. (2) Regulations made under subsection (1) above may, in particular— (a) allow the making of such an order at any time during the proceedings;..."
"3—(1) Subject to the provisions of this regulation, where at any time during criminal proceedings— (a) a magistrates' court (b) the Crown Court, or (c) the Court of Appeal is satisfied that costs have been incurred in respect of the proceedings by one of the parties as a result of an unnecessary or improper act or omission by, or on behalf of, another party to the proceedings, the court may, after hearing the parties, order that all or part of the costs so incurred by that party shall be paid to him by the other party."
"...it is inconceivable that Parliament should have intended the power to award costs to be exercisable only during the course of the proceedings in respect of which the award is to be made. A final order for costs can only be made after the proceedings have been concluded. Regulation 3(1) is not happily worded but must be construed as providing for a final costs order to be made in the normal way because it authorises an award of costs incurred 'in respect of the proceedings', a phrase which must include the whole of the proceedings, and requires the court to hear the parties before making the order. It is only after hearing the parties that the court can be 'satisfied' that an award should be made. The purpose and effect of s.19(2)(a) and reg 3(1) seem to me to have been not to vary the normal procedure by which a final order of costs is made at the end of the proceedings — that is to say after they have been ended by a verdict, or by a notice of discontinuance — but to give the court power to make an interim order of costs while the proceedings are still in progress. In short, the result of a notice of discontinuance in my judgment is to bring the proceedings to an end in the same way as a verdict would have brought them to an end but to leave the normal jurisdiction of the court in the matter of costs unaltered."
"The conclusion that I have reached as to the effect of a notice of discontinuance by the prosecutor... is that the justices cease to be able to hear the substance of the matter which has been discontinued but they still have jurisdiction to entertain and decide applications for costs both under s.16 and under s.19 of the 1985 Act."