Paragraph 4
If the cost so stated differs from the amount estimated in accordance with paragraph 2—
(a)
if it is greater, the amount of the difference shall be notified by the Secretary of State to the applicant, shall be the amount of the final fee payable and shall be paid forthwith; and
(b)
if it is less, the initial fee shall be re-determined accordingly and the amount of the difference shall be paid forthwith to the applicant by the Secretary of State.