42.—(1) Where the Director-General has incurred costs and expenses in connection with the execution of any works, which are, under this Act, payable by or recoverable from the owner or occupier of any premises, vessel or aircraft, as the case may be, the Director-General may, if he thinks fit, obtain an undertaking from such owner or occupier for the payment of such instalments as will be sufficient to defray the whole amount of such costs and expenses.
(2) Upon default in payment of any instalment upon the date appointed for payment thereof by any such undertaking, the whole of the balance then outstanding of such amount shall immediately become due and payable and, notwithstanding any change in the ownership or occupation of the premises, vessel or aircraft since the date of the undertaking, may be recovered by the same means and in the like manner as provided in section 41.