The International Development Association (Eleventh Replenishment) Order 1998
The Overseas Development and Co-operation Act 1980, section 6(2), provides that if the Government of the United Kingdom becomes bound by arrangements for the making of additional payments to the International Development Association, the Secretary of State may, with the approval of the Treasury, provide by order for the payment out of money provided by Parliament of any sums required by her for any of the purposes specified in that subsection.