"(1) A plea of guilty may be taken into account in mitigation of
sentence where-
(a) it results from genuine remorse, repentance or
contrition, or
(b) it results from a willingness to co-operate in the
administration of justice by saving the expense and
inconvenience of a trial, or the necessity of
witnesses giving evidence, or results from some other
consideration which is in the public interest;
notwithstanding that the motive, or one of the
motives, for such co-operation may be a desire to earn
leniency,
and where to allow the plea a mitigatory effect would be
conductive to the public purposes which the sentencing judge
is seeking to achieve.
(2) A plea of guilty is not of itself a matter of mitigation
where it does not result from any of the above motives, but
only from a recognition of the inevitable, or is entered as
the means of inducing the prosecution not to proceed with a
more serious charge.
(3) In cases falling within (1), the judge is not bound to make
a reduction, but should consider the plea with all the other
relevant factors in arriving at a proper sentence.
(4) In assessing the weight to be attached to a plea of guilty
as a factor making for leniency, it is proper for the judge
to bear in mind that it is important to the administration
of justice that guilty persons should not cause expense to
the public and delay to other cases by putting forward false
stories and on the basis of such false stories contesting
the charges against them.
(5) The above propositions are not to be taken as weakening in
any way the principle that there must be no increase in the
sentence which is appropriate to the crime because the
offender has contested the charge."