The court or coroner may, in the course of any trial or coronial inquest, discharge a juror if--
(a) the juror (though able to discharge the duties of a juror) has, in the judge's or coroner's opinion, become so ill, infirm or incapacitated as to be likely to become unable to serve as a juror before the jury delivers their verdict or has become so ill as to be a health risk to other jurors or persons present at the trial or coronial inquest, or
(b) it appears to the court or coroner (from the juror's own statements or from evidence before the court or coroner) that the juror may not be able to give impartial consideration to the case because of the juror's familiarity with the witnesses, parties or legal representatives in the trial or coronial inquest, any reasonable apprehension of bias or conflict of interest on the part of the juror or any similar reason, or
(c) a juror refuses to take part in the jury's deliberations, or
(d) it appears to the court or coroner that, for any other reason affecting the juror's ability to perform the functions of a juror, the juror should not continue to act as a juror.
Note : Section 22 provides for the continuation of a trial or inquest on the death or discharge of a juror.