(1) Sections 24 and 32A do not authorize the commutation of a pension benefit in so far as the pension benefit has been increased by virtue of this Part.
(2) Where:
(a) a portion of the pension benefit of a person is commuted during a prescribed half - year; and
(b) the person became entitled at the commencement of the half - year to an increase under this Part in the rate at which pension benefit was payable to him immediately before the commencement of that half - year;
the rate at which the pension benefit is payable to him on and after the date on which that portion of the pension benefit is so commuted is the rate at which the pension benefit would have been payable to him at the commencement of the half - year if:
(c) he had commuted that portion of his pension benefit on the date on which he became entitled to the pension benefit; and
(d) he had attained, on the date on which he became entitled to the pension benefit, the age that is his age on the date of commutation.