5.15.—(1) A secured creditor may, with the agreement of the housing administrator or the permission of the court, at any time alter the value which that creditor has put upon a security in a proof.
(2) Where a secured creditor has voted in respect of the unsecured balance of the debt—
(a)the secured creditor may re-value the security only with the agreement of the housing administrator or the permission of the court; and
(b)where the revaluation was by agreement, the housing administrator must deliver a notice of the revaluation to the creditors within five business days after the housing administrator’s agreement.