Where a magistrates’ court has ordered one person to pay to another any sum of money, and proceedings are taken before that or any other magistrates’ court to enforce payment of that sum, then—
(a)if the person to whom the sum is ordered to be paid is a clerk of a magistrates’ court, a certificate purporting to be signed by the clerk that the sum has not been paid to him; and
(b)in any other case a document purporting to be a statutory declaration by the person to whom the sum is ordered to be paid that the sum has not been paid to him,
shall be admissible as evidence that the sum has not been paid to him, unless the court requires the clerk or other person to be called as a witness.