12.—(1) The jury to try any issue shall be selected by ballot in open court from the panel, or a section of the panel, of persons summoned to attend for jury service at the time and place in question.
(2) Without prejudice to Article 18, the jurors whose names are selected by ballot shall, subject to all just challenges and objections, be the jurors to try the issues for which they are summoned.
(3) Subject to any statutory provision, where a jury has tried, or been selected to try, an issue, the court, with the consent of both parties to any other issue, may—
(a)try that other issue with that jury; or
(b)set aside any member of that jury whom the parties consent to withdraw or who is justly challenged or is excused by the court and, another member having been selected by ballot, try that other issue with the jury as so reconstituted;
and the powers conferred by this paragraph may be exercised so long as any issue remains to be tried.