(1) Where a person is convicted of an offence, the exercise of power conferred by virtue of section 72(2)(e) in relation to proceedings for the offence shall not be called into question on an appeal against the conviction.
(2) In the application of section 72 in relation to proceedings on indictment, "preliminary stage" does not include a stage -
(a) after the time when the case for the prosecution is opened, or
(b) if the court accepts a plea of guilty before the case for the prosecution is opened, after the plea is accepted.
(3) In the application of section 72 in relation to summary proceedings, "preliminary stage" does not include a stage -
(a) after the court begins to hear evidence for the prosecution at the trial,
(b) if the court accepts a plea of guilty before it has begun to hear evidence for the prosecution, after the plea is accepted, or
(c) after the court begins to consider whether to exercise its power under Article 44(4) of the Mental Health (Northern Ireland) Orde