Provision as to unexpended budget grants.

If the whole budget or any portion thereof remains unexpended at the close of the year in the budget estimates for which such grant was included, and if the amount thereof has not been taken into account in the opening balance of the Municipal Fund or the Transport Fund, as the case may be, entered in the budget estimates of any of the two following years, the Standing Committee or the Transport Committee, as the case may be, may sanction the expenditure of such budget grants or such unexpended portion thereof, as the case may be, during the next two following years for the completion, according to the original intention or sanction, of the purpose or object for which the budget grant was made, but not upon any other purpose or object.