Fresh evidence relating entirely to events occurring after sentence is inadmissible on a sentence appeal where there is no sentencing error; such matters are for the Executive prerogative of mercy. Fresh evidence may be admitted only to bring before the Court facts existing at the time of sentence but unknown to the sentencing judge, or to explain known facts in a new light, and only in exceptional cases. A prosecution concession on concurrent sentencing is a factor but does not bind the sentencing judge.
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