"The prosecution, viewed as a single entity, have, by means which are at least arguably unlawful, deprived the defence of its strategic ability to mount the challenge to the integrity of the prosecution case when looked at in the round."
"where, in the light of the admitted facts, the erroneous ruling left the defendant at trial with no legal basis for a verdict of not guilty. Put the other way round on appeal when the error is corrected, it is "that upon the admitted facts", the appellant "could not in law have been convicted of the offence charged"
"In appeals against conviction following a plea of guilty, the somewhat mechanical test of whether a change of plea to guilty was 'founded upon' a particular feature of the trial, namely a wrong direction of law or material irregularity, gives way to the more direct question whether, given the circumstances prompting the change of plea to guilty, the conviction is unsafe. However, even when put that way, the good sense of preferring the narrower interpretation, which we have identified, of the expression 'founded upon' lingers on. Thus, a conviction would be unsafe where the effect of an incorrect ruling of law on admitted facts was to leave an accused with no legal escape from a verdict of guilty on those facts. But a conviction would not normally be unsafe where an accused is influenced to change his plea to guilty because he recognises that, as a result of a ruling to admit strong evidence against him, his case on the facts is hopeless. A change of plea to guilty in such circumstances would normally be regarded as an acknowledgement of the truth of the facts constituting the offence charged. We qualify the above proposition with the word 'normally', because there remains the basic rule that the Court should quash as unsafe a conviction where the plea was mistaken or without intention to admit the truth of the offence charged."
" . . . the court, in order to protect its own process from being degraded and misused, must have the power to stay proceedings which have come before it and have only been made possible by acts which offend the court's conscience as being contrary to the rule of law. Those acts by providing a morally unacceptable foundation for the exercise of jurisdiction over the suspect taint the proposed trial and, if tolerated, will mean that the court's process has been abused."
" Bennett was a case where a stay was appropriate because a defendant had been forcibly abducted and brought to this country to face trial in disregard of extradition laws. The speeches in Bennett conclusively establish that proceedings may be stayed in the exercise of the judge's discretion not only where a fair trial is impossible but also where it would be contrary to the public interest in the integrity of the criminal justice system that a trial should take place. An infinite variety of cases could arise. General guidance as to how the discretion should be exercised in particular circumstances will not be useful. But it is possible to say that in a case such as the present the judge must weigh in the balance the public interest in ensuring that those who are charged with grave crimes should be tried and the competing public interest in not conveying the impression that the court will adopt the approach that the end justifies any means."
"It arises not from the relationship between the prosecution and the defendant, but from the relationship between the prosecution and the court. It arises from the court's need to exercise control over executive involvement in the whole prosecution process, not limited to the trial itself."
"Having regard to these considerations, namely the combined effect of lack of disclosure at trial and the special nature of Bennett -type abuse, we do not consider that failure to seek the trial judge's ruling on abuse is fatal to the appeal."
"It may be that a conviction in a trial which should never have taken place is to be regarded as unsafe for that reason. It may be that, despite the statutory basis of the court's jurisdiction, it has also some inherent or ancillary jurisdiction basis for intervening to mark abuse of process by quashing a conviction when it considers that the court below should have stayed the proceeding. Or it may be that the recent amendment to the 1968 Act has removed the supervisory role of this court over abuse of criminal process where the affront to justice, however outrageous, has not so prejudiced the defendant in his trial as to render his conviction unsafe. All that is for decision by another court in an appropriate case."
"The Court must also have regard to the fact that the Court of Appeal was concerned with the safety of the applicants' conviction, not whether they had in the circumstances received a fair trial. In the Court's opinion, the question whether or not the rights of the defence guaranteed to an accused underArticle 6 of the Convention were secured in any given case cannot be assimilated to a finding that his conviction was safe in the absence of any enquiry into the issue of fairness. In the above-mentioned Edwards case the Court of Appeal considered in detail the impact of the information withheld from the defence ( ibid ., p.35, §35). It was able to assess for itself the probative value of that information in the light of the arguments of the defence which was by that stage in possession of the information and to determine whether the availability of that information at trial would have disturbed the jury's verdict. Accordingly, the rights of the defence were secured by the review conducted on appeal. 66. However, in the case at issue it was the function of the jury, properly directed, to decide whether or not to draw an adverse inference from the applicants' silence. Section 34 of the 1994 Act specifically entrusted this task to the jury as part of a legislative scheme designed to confine the use which can be made of an accused's silence at his trial. In the circumstances the jury was not properly directed and the imperfection in the direction could not be remedied on appeal. Any other conclusion would be at variance with the fundamental importance of the right to silence, a right which, as observed earlier, lies at the heart of the notion of a fair procedure guaranteed by Article 6. On that account the Court concludes that the applicants did not receive a fair hearing within the meaning of Article 6.1 of the Convention."
"In short, the defence claimed to be entitled to ascertain the legality of those activities of Customs and Excise, with a view to showing that they had been illegally conducted, to the knowledge of responsible officials conducting Operation Steeler [the name given to the surveillance operation], whose overall credit could thereby be impugned."
"On the material placed before me, there has to be serious doubt that either of them or their superiors complied with the obligation of honesty and integrity, by which they were and are bound."
"by abuse of executive authority, the prosecution, viewed as a single entity, have, by means which are at the least arguably unlawful, deprived the defence of its strategic ability to mount the challenge to the integrity of the prosecution case when looked at in the round."
"If this trial were to be allowed to continue on the state of present disclosure, the defence would, in my judgment, have withheld from it the opportunity properly and effectively to challenge the integrity of the three witnesses whom I have identified, but there may well be others. In this situation, where challenge has been made to the legality of conduct and the response has been the self serving assertion "