10—General principles of sentencing
(1) Subject to this
Act or any other Act, in determining a sentence for an offence, a court must
apply (although not to the exclusion of any other relevant principle) the
common law concepts reflected in the following principles:
(a)
proportionality;
(b)
parity;
(c)
totality;
(d) the
rule that a defendant may not be sentenced on the basis of having committed an
offence in respect of which the defendant was not convicted.
(2) Subject to this
Act or any other Act, a court must not impose a sentence of imprisonment on a
defendant unless the court decides that—
(a) the
seriousness of the offence is such that the only penalty that can be justified
is imprisonment; or
(b) it
is required for the purpose of protecting the safety of the community (whether
as individuals or in general).