If in respect of any financial year it is found—
(a) that the amount appropriated by the Appropriation Act to any purpose is insufficient or that a need has arisen for expenditure for a purpose to which no amount has been appropriated by that Act; or
(b) that any monies have been expended for any purpose in excess of the amount appropriated to that purpose by the Appropriation Act or for a purpose to which no amount has been appropriated by that law,
a supplementary estimate showing the sums required or spent shall be laid before the House and, when the supplementary estimate has been approved by the House, a Supplementary Appropriation Bill shall be introduced in the House providing for the issue of such sums from the Consolidated Fund and appropriating them to the purposes specified therein.