(4) The Governor-General shall not appoint a day for the purposes of subsection (3) unless the Minister of Justice has advised him that the Commissioner of Inland Revenue has confirmed that the Bank has paid, or has given an undertaking (in terms acceptable to the Commissioner) to pay, to the Commissioner such sum of money as the Commissioner considers is the amount of stamp duties that would have been payable to the Crown in respect of all assets to be transferred by virtue of this Act if those assets had been transferred other than by virtue of this Act.