Sums payable under a maintenance decision registered in Northern Ireland under the Convention, including any arrears so payable, shall be paid in sterling.

Where the maintenance decision is expressed in any other currency, the amounts shall be converted on the basis of the exchange rate prevailing on the date on which the application for registration was received by the Department of Justice for transmission to a court or received by the Lord Chancellor pursuant to Regulation 3(2).

For the purposes of this paragraph, a written certificate purporting to be signed by an officer of any bank in the United Kingdom and stating the exchange rate prevailing on a specified date shall be evidence of the facts stated.