If on a defendant's trial before a judge and jury for an offence the court is satisfied at any time after the close of the case for the prosecution that—
the case against the defendant is based wholly or partly on a statement not made in oral evidence in the proceedings, and
the evidence provided by the statement is so unconvincing that, considering its importance to the case against the defendant, his conviction of the offence would be unsafe,
the court must either direct the jury to acquit the defendant of the offence or, if it considers that there ought to be a retrial, discharge the jury.
Where—
a jury is directed under subsection (1) to acquit a defendant of an offence, and
the circumstances are such that, apart from this subsection, the defendant could if acquitted of that offence be found guilty of another offence,
the defendant may not be found guilty of that other offence if the court is satisfied as mentioned in subsection (1) in respect of it.
If—
a jury is required to determine under section 4A(2) of the Criminal Procedure (Insanity) Act 1964 (c. 84) whether a person charged on an indictment with an offence did the act or made the omission charged, and
the court is satisfied as mentioned in subsection (1) above at any time after the close of the case for the prosecution that—
the case against the defendant is based wholly or partly on a statement not made in oral evidence in the proceedings, and
the evidence provided by the statement is so unconvincing that, considering its importance to the case against the person, a finding that he did the act or made the omission would be unsafe,
the court must either direct the jury to acquit the defendant of the offence or, if it considers that there ought to be a rehearing, discharge the jury.
This section does not prejudice any other power a court may have to direct a jury to acquit a person of an offence or to discharge a jury.