For multiple armed robberies forming part of one series of criminal events committed by a young offender whose drug addiction arose from self-medication following a parent's death, an effective head sentence of 11 years with a 7-year non-parole period was manifestly excessive; 9.5 years with a 5.5-year non-parole period was appropriate. The Thomson & Houlton discount methodology can be used to test whether a sentencing judge's starting point was too high.
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