One wrong leads to another

One sentencing principle that regularly makes an appearance in appellate judgments is that of parity, which states that it is appealable error where the sentences between co-offenders are so different (or not different enough) as to create a "justifiable sense of grievance". Where all co-offenders are sentenced at the one time, parity arguments seem to me to have particular potency, as it indicates that a single judge has failed to adopt a consistent approach to sentencing co-offenders, or alternatively, has failed to recognise the significant differences between the sentences that are appropriate for different co-offenders. But parity is not only relevant when all co-offenders are sentenced at once. It applies equally, though with more difficulty, when several co-offenders are sentenced by separate judges.

Recently though, courts have grappled with the question of how to deal with a parity ground of appeal when the comparison sentence is inadequate and the offender received an appropriate disposition. Can an offender be said to have a justifiable sense of grievance for not receiving a manifestly inadequate sentence, such as the one his co-offender received? Regrettably, the answer is yes.