The Statutory Scheme
11 At the time of the application under s10(4), s10 provided:
"10(1) If, in respect of an offence:
(a) the Attorney General determines that an inquiry should be conducted and does not subsequently determine, before the inquiry is commenced, that there is no longer any need for such an inquiry to be conducted, or
(b) the question of a person's unfitness to be tried for the offence is raised after the person is arraigned on a charge in respect of the offence,
the Court must (except as provided by this section), as soon as practicable after the Attorney General's determination is made or the question is raised, as the case may be, conduct an inquiry in order to determine whether the person is unfit to be tried for the offence.
(2) The Court must not conduct an inquiry into the question of a person's unfitness to be tried for an offence unless it appears to the Court that the question has been raised in good faith.
(3) Before conducting an inquiry, the Court may do any one or more of the following:
(a) adjourn the proceedings,
(b) grant the accused person bail in accordance with the Bail Act 1978,
(c) remand the accused person in custody for a period not exceeding 28 days,
(d) request the accused person to undergo a psychiatric examination or other examination,
(e) request that a psychiatric report or other report relating to the accused person be obtained,
(f) discharge any jury constituted for the purpose of those proceedings,
(g) make any other order that the Court considers appropriate.
(4) If, in respect of a person charged with an offence, the Court is of the opinion that it is inappropriate, having regard to the trivial nature of the charge or offence, the nature of the person's disability or any other matter which the Court thinks proper to consider, to inflict any punishment, the Court may determine not to conduct an inquiry and may dismiss the charge and order that the person be released."
12 Section 11 of the Act provided that the determination of a person's unfitness for trial was to be made by a jury. However, the judge was empowered to determine the issue alone in the circumstances set out in s11A. The Act has subsequently been amended in this respect to establish a regime where fitness to be tried is to be determined by a judge alone in all circumstances.
13 In order to understand one of the authorities to be considered below, it is relevant to set out part of s11 and s11A as previously in force:
"11(1) The question of a person's unfitness to be tried for an offence is to be determined by a jury constituted for that purpose, except as provided by section 11A.
…
11A(1) The question of a person's unfitness to be tried for an offence is to be determined by the Judge alone if the person so elects in accordance with this section and the Judge is satisfied that the person, before making the election, sought and received advice in relation to the election from a barrister or solicitor.
… "
14 The immediate context of s10 was Pt 2 of the Act. At all times ss4-9 and 12 provided:
"4 This Part applies to criminal proceedings in the Supreme Court (including criminal proceedings within the summary jurisdiction of the Supreme Court) and criminal proceedings in the District Court.
5 The question of a person's unfitness to be tried for an offence may be raised by any party to the proceedings in respect of the offence or by the Court.
6 The question of a person's unfitness to be tried for an offence is to be determined on the balance of probabilities.
7(1) The question of a person's unfitness to be tried for an offence is, so far as practicable, to be raised before the person is arraigned on a charge in respect of the offence but may be raised at any time during the course of the hearing of the proceedings in respect of the offence.
(2) Nothing in this section prevents the question of a person's unfitness to be tried for an offence from being raised on more than one occasion in respect of the same proceedings.
8(1) If the question of a person's unfitness to be tried for an offence is raised at any time before the person is arraigned on a charge in respect of the offence, the Attorney General must determine whether an inquiry should be conducted before the hearing of the proceedings in respect of the offence.
(2) The Attorney General may, at any time before the inquiry is commenced, determine that there is no longer any need for such an inquiry to be conducted.
9 If the question of a person's unfitness to be tried for an offence is raised after the person is arraigned on a charge in respect of the offence, the Court must hear any submissions relating to the conducting of an inquiry in the absence of any jury which has been constituted for the purposes of the proceedings relating to the offence.
…
12(1) At an inquiry, the accused person is, unless the Court otherwise allows, to be represented by counsel or a solicitor.
(2) An inquiry is not to be conducted in an adversary manner.
(3) The onus of proof of the question of a person's unfitness to be tried for an offence does not rest on any particular party to the proceedings in respect of the offence.
(4) At the commencement of an inquiry the Court is to explain to the jury the reason for the inquiry, the findings which may be made on the inquiry and the consequences, both at law and otherwise, of those findings."
15 The Act makes provision for the alternative circumstances in which a person is found fit or found unfit to be tried. Where found fit, s13 provides that proceedings will occur "in accordance with the appropriate criminal procedures".
16 Where a person is found unfit, the person must be referred to the Mental Health Review Tribunal pursuant to s14. Where the Tribunal finds that the person would not be fit within 12 months, provision is made for a special hearing under the Act at the direction of the Attorney General.
17 At the time of the application in the present case, the relevant provisions with respect to a special hearing were:
"19(1) If the Attorney General directs that a special hearing be conducted in respect of an offence with which a person is charged, the appropriate Court must, as soon as practicable after the Attorney General so directs, conduct a special hearing for the purpose of ensuring, despite the unfitness of the person to be tried in accordance with the normal procedures, that the person is acquitted unless it can be proved to the requisite criminal standard of proof that, on the limited evidence available, the person committed the offence charged or any other offence available as an alternative to the offence charged.
(2) The question whether a person has committed an offence charged or any other offence available as an alternative to an offence charged is, except as provided by section 21A, to be determined at a special hearing by a jury constituted for that purpose.
(3) The Jury Act 1977 applies to and in respect of the constitution of a jury and a jury constituted as referred to in subsection (2) in the same way as it applies to and in respect of the constitution of a jury and a jury for the trial of any criminal proceedings.
(4) A member of a jury otherwise constituted for the purpose of any proceedings relating to the same accused person and the same offence is disqualified from being a member of a jury constituted as referred to in this section.
18 Section 21 made provision for a special hearing by judge alone. The Act further provided:
"22(1) The verdicts available to the jury or the Court at a special hearing include the following:
(a) not guilty of the offence charged,
(b) not guilty on the ground of mental illness,
(c) that on the limited evidence available, the accused person committed the offence charged,
(d) that on the limited evidence available, the accused person committed an offence available as an alternative to the offence charged.
(2) A verdict in accordance with subsection (1)(b) is to be taken to be equivalent for all purposes to a special verdict that an accused person is not guilty by reason of mental illness under section 38.
(3) A verdict in accordance with subsection (1)(c) or (d):
(a) constitutes a qualified finding of guilt and does not constitute a basis in law for any conviction for the offence to which the finding relates, and
(b) subject to section 28, constitutes a bar to further prosecution in respect of the same circumstances, and
(c) is subject to appeal in the same manner as a verdict in an ordinary trial of criminal proceedings, and
(d) is to be taken to be a conviction for the purpose of enabling a victim of the offence in respect of which the verdict is given to make a claim for compensation.
23(1) If, following a special hearing, it is found on the limited evidence available that an accused person committed the offence charged or some other offence available as an alternative, the Court:
(a) must indicate whether, if the special hearing had been a normal trial of criminal proceedings against a person who was fit to be tried for the offence which the person is found to have committed, it would have imposed a sentence of imprisonment, and
(b) where the Court would have imposed such a sentence, must nominate a term, in this section referred to as a limiting term , in respect of that offence, being the best estimate of the sentence the Court would have considered appropriate if the special hearing had been a normal trial of criminal proceedings against a person who was fit to be tried for that offence and the person had been found guilty of that offence.
(2) If a Court indicates that it would not have imposed a sentence of imprisonment in respect of a person, the Court may impose any other penalty or make any other order it might have made on conviction of the person for the relevant offence in a normal trial of criminal proceedings.
(3) Any such other penalty imposed or order made, under subsection (2), is to be subject to appeal in the same manner as a penalty or order in a normal trial of criminal proceedings.
(4) In nominating a limiting term in respect of a person or imposing any other penalty or making any other order, the Court may, if it thinks fit, take into account the periods, if any, of the person's custody or detention before, during and after the special hearing (being periods related to the offence).
(5) A limiting term nominated in respect of a person takes effect from the time when it is nominated unless the Court, after taking into account the periods, if any, of the person's custody or detention before, during and after the special hearing (being periods related to the offence), directs that the term be taken to have commenced at an earlier time."
19 There is further detailed provision, which it is unnecessary to set out.