19. If under the pension scheme to which the claimant was last subject before suffering loss of employment the amount of any pension to which he might have become entitled might have been increased at the discretion of the authority administering the pension scheme or of any other body or if under the said pension scheme any additional or supplementary payments might have been made to the claimant on his becoming entitled to a pension, the compensating authority may increase the compensation payable under paragraph 11 or 12 of this Schedule by an annual sum not exceeding the amount by which his accrued incapacity pension or 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.