Where the Crown concedes that a witness is a witness of truth and the sentencing judge accepts that it would be unfair to proceed on any basis other than that witness's version, the judge must sentence consistently with that version on all material matters, not merely on 'a couple of contested features'. Factual findings adverse to the accused must be established beyond reasonable doubt. Provocation in the non-technical sense (including discovery of a partner's infidelity and being attacked with a knife) is a mitigatory factor that must be given weight in sentencing.
The full text is available to signed-in members, including the 3 later cases that cite this judgment.
1 of the 3 citing cases carry a classified treatment. How each court treated it is available to signed-in members.