6 I agree, with respect, with the observations made in those cases that in the exercise of the sentencing discretion conferred by the Road Safety (Alcohol and Drugs) Act 1970, substantial weight must be given to the need to protect the public and to deter potential offenders. I am also of the view that when imposing penalty magistrates ought to have regard to statements of sentencing policy made by this Court and should strive for consistency in the penalties they impose by having regard to the range of the penalties which are usually imposed in respect of different classes of offences. But considerations of that kind cannot be elevated to the status of rules of law and must be applied subject to the well-established principle of law that it is not competent for this, or any other, court to impose rigid limitations upon the exercise of a discretionary power which an Act of Parliament has conferred in unqualified terms. That latter proposition applies a fortiori to the discretion to order that a person in breach of s6 of the Road Safety (Alcohol and Drugs) Act 1970 be disqualified from driving because the discretion conferred by s17 of the Act is unfettered and because s43C of the Traffic Act 1925 expressly recognises the power of a court which is imposing penalty in respect of such a breach to award demerit points, or to make no order affecting an offender's licence, instead of ordering disqualification. It is true that the provisions of s19 of the Road Safety (Alcohol and Drugs) Act 1970 relating to the granting of restricted licences to persons who have been disqualified from driving indicate a legislative expectation that some persons convicted of offences against the Act will be disqualified from driving, but they do not indicate any legislative expectation that any particular proportion of such persons will be disqualified.