“References unders.36 of the Criminal Justice Act 1988 are made for the purpose of the avoidance of gross error, the allaying of wide-spread public concern at what may appear to be an unduly lenient sentence and the preservation of public confidence in cases where a judge appears to have departed to a substantial extent from the norms of sentencing generally applied by the courts in cases of a particular type… We remind ourselves that the hurdle is a high one. For appellate interference to be justified the sentence in question must be not only lenient but unduly so.”
“A sentence is unduly lenient, we would hold, where it falls outside the range of sentences which the judge, applying his mind to all the relevant factors, could reasonably consider appropriate.”