If under the pension scheme to which a whole-time or part-time pensionable officer was last subject before suffering loss of office the amount of any pension to which he might have become entitled might have been increased by virtue of the exercise of any discretion conferred by the pension scheme, the determining authority may determine to increase the annual sum payable as compensation under paragraph 13 of this Schedule by an annual sum not exceeding the amount by which his accrued pension might have been increased or the annual value of the payments which might have been made to him by way of addition to, or supplementation of, his accrued pension.