“We are not persuaded…that the principle set out in Murphy is wrong or that we should not follow it. This is a claim for judicial review in a criminal cause or matter, and the criminal costs scheme should apply unless there are exceptional reasons to take a different course.”
“(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.”
“In these circumstances, it seems to me impossible to maintain that there were no grounds upon which the justices could reasonably conclude that there had been an improper omission on the part of the prosecution. I would add in this connection that the word "improper" in this context does not necessarily connote some grave impropriety. Used, as it is, in conjunction with the word "unnecessary," it is in my judgment intended to cover an act or omission which would not have occurred if the party concerned had conducted his case properly.”
“146. .. I consider that cases in which it will be appropriate to make (let alone grant) a section 19 application against a public prosecutor will be very rare, and restricted to those exceptional cases where the prosecution has made a clear and stark error as a result of which a defendant has incurred costs for which it is appropriate to compensate him. For example, where it is alleged that the decision to prosecute or a similar prosecutorial decision is the improper act on which a section 19 application is founded, it is difficult to conceive of circumstances in which it could succeed unless the decision was shown to be unlawful in a public law sense, ie leaving aside decisions unlawful because made in pursuance of an unlawful policy of the prosecutor (or made other than in accordance with the prosecutor’s own lawful policy), if the decision was one which no reasonable prosecutor could have made. If it is a decision that a reasonable prosecutor could have made, then generally a section 19 costs order will not be appropriate.”
“Each case will be face-dependent; but cases in which a section 19 application against a public prosecutor will be appropriate will be very rare, and generally restricted to those exceptional cases where the prosecution has acted in bad faith or made a clear and stark error as a result of which a defendant has incurred costs for which it is appropriate to compensate him. The court will be slow to find that such an error has occurred. Generally, a decision to prosecute or similar prosecutorial decision will only be an improper act by the prosecution for these purposes if, in all the circumstances, no reasonable prosecutor could have come to that decision.”