"(3) At a pre-trial hearing, a magistrates' court may make a ruling as to any matter mentioned in sub-section (4) if — (a) the condition in sub-section (5) is met (b) the court has given the parties an opportunity to be heard, and (c) it appears to the court that it is in the interests of justice to make the ruling."
"(3) A magistrates' court may discharge or vary (or further vary) a ruling under section 8A if — (a) the condition in section 8A (5) is met (b) the court has given the parties an opportunity to be heard, and (c) it appears to the court that it is in the interests of justice to do so. (4) The court may act under subsection (3) — (a) on an application by a party to the case, or (b) of its own motion. (5) No application may be made under sub-section (4)(a) unless there has been a material change of circumstances since the ruling was made or, if a previous application has been made, since the application (or last application) was made."
"In my judgment the whole scheme of the Act suggests that they do not have that power [ie power to reverse a decision taken earlier] before embarking upon a hearing. Once a decision has been made after proper inquiry and consideration of all relevant factors, it cannot be reversed merely by re-examining the case afresh on the same material. It seems to me that they may well have had the opportunity of taking a different view from that taken by their colleagues in the light of the new and additional factors which have emerged since 20 September" [ie the further offending by the defendant]. However the justices had not proceeded on that basis: "
"But in a case where trial on indictment has been decided upon it is in my opinion open to the justices to review that decision at any stage up to the start of their inquiries by the justices. Such a review will be permissible in the case if a change of circumstances has occurred since the original decision was taken and also circumstances are brought to the attention of the court which, although existing when the original decision was taken, were not then drawn to the attention of a court."
"26 ..... It is necessary for the efficacious administration of justice to take a strict approach to the power of a lower court to revisit and revoke an order earlier made by itself. Clearly there must be some power to do so in the interests of justice. It arises, as my Lord has indicated, where there is a change of circumstances. Plainly that must be a change of relevant circumstances. 27 I would expect that cases in which an earlier existing circumstance, not drawn to the attention of the Court at the first hearing, would justify the court in later overturning its first decision would be most infrequent."