"The areas where lack of such an expert is a potential problem, in my judgment, is where the prosecution seek to rely on the proximity of a signal from a very particular mast to the proximity of a defendant as observed by the police."
"But without an expert to assist, as is often the case, to show the jury where a particular mast is, its direction, its next closest mast, its expected range and various other variables, I am satisfied that it would be unfair to include the evidence of the eleven very specific incidents that the prosecution rely on ... without there being evidence from an expert with particular, sufficient expertise because the jury would need assistance in such matters, and there would be reasonable questions to be asked by the defence."
"In effect the Crown is bound to accept, as the price of bringing an interlocutory appeal under s 58, the consequence that if it fails the Defendant must be acquitted ..."
"An acquittal agreement is the price that the Crown must pay for exercising its right of appeal under section 58. The court has no role to play and in particular has no power to decide whether an acquittal agreement is objectively justified on the facts of the case."
"The decision involved an exercise of discretion. It has not been suggested that the judge failed to take into account a material factor or took into account an immaterial factor. The sole complaint is that he gave too much weight to one consideration and insufficient weight to another. It is trite law that the weight to be given to relevant factors is for the decision-maker and the court will not interfere unless the decision is perverse."
"When the judge has exercised his discretion or made his judgment for the purposes of and in the course of a criminal trial, the very fact that he has had carefully to balance conflicting considerations will almost inevitably mean that he might reasonably have reached a different, or the opposite conclusion to the one he did reach. Leave to appeal under section 67 of the 2003 Act will not be given by this court unless it is seriously arguable, not that the discretionary jurisdiction might have been exercised differently, but that it was unreasonable for it to have been exercised in the way that it was. No trial judge should exercise his discretion in a way which he personally believes may be unreasonable. That is not to say that he will necessarily find every such decision easy. But the mere fact that the judge could reasonably have reached the opposite conclusion to the one he reached, and that he acknowledges that there were valid arguments which might have caused him to do so, does not begin to provide a basis for a successful appeal, whether, as in the circumstances here, by the prosecution or, when it arises, by the defendant."