The Secretary may require any person to whom a notice under subsection (1) of this section has been duly given to pay to the Secretary all or any part the Secretary thinks fit of the direct and indirect costs to the Ministry of Transport or, as the case requires, to the Department of Conservation of considering whether or not to give the notice and of giving it; and in that case—

Any amount recoverable under subsection (1a) of this section is in addition to any amount recoverable under subsection (2) of this section.

Where, in accordance with section 2(1a) of this Act, any amount is recovered under this section by the Director-General, it shall be deemed to have been paid under the Conservation Act 1987.”