"The appropriate court may, at any time before the expiry of a [custody] time limit..., extend or further extend, that limit; but the court shall not do so unless it is satisfied - (a) that the need for the extension is due to - (i) the illness or absence of the accused, a necessary witness, a judge or a magistrate; (ii) a postponement which is occasioned by the ordering by the court of separate trials in the case of two or more accused or of two or more offences; or (iii) some other good and sufficient cause; and (b) that the prosecution has acted with all due diligence and expedition."
"...the matter has to be considered by reference to the presence or want of all due expedition at the stage to which the custody time limit relates. That is, in the present case, the period following the preferment of the voluntary bill."
"The Secretary of State may by regulations make provision, with respect to any specified preliminary stage of proceedings for an offence, as to the maximum period- (a) to be allowed to the prosecution to complete that stage; (b) during which the accused may, while awaiting completion of that stage, be (i) in the custody of a magistrates' court; or (ii) in the custody of the Crown Court; in relation to that offence."
"To satisfy the court that this condition is met the prosecution need not show that every stage of preparation of the case has been accomplished as quickly and efficiently as humanly possible. That would be an impossible standard to meet, particularly when the court which reviews the history of the case enjoys the immeasurable benefit of hindsight. Nor should the history be approached on the unreal assumption that all involved on the prosecution side have been able to give the case in question their undivided attention. What the court must require is such diligence and expedition as would be shown by a competent prosecutor conscious of his duty to bring the case to trial as quickly as reasonably and fairly possible."