PART VII
TRIAL, DEFENCE, VERDICT, ETC.
38. Trial of offences.
(5) Where a person arraigned on an indictment pleads not guilty of an offence charged in the indictment but guilty of some other offence of which he might be found guilty on that plea of guilty without trial for the offence of which he has pleaded not guilty, then (whether or not the two offences are separately charged in distinct counts) his conviction of the one offence shall be an acquittal of the other.
National proceedings on admission of guilt
EDIT.