21.—(1) The Safety Authority may charge a person applying for an authorisation a fee that must—
(a)not exceed the sum of the costs reasonably incurred by the Safety Authority in carrying out the work relating to the application; and
(b)be set out in an invoice that includes a statement of the work done and the costs reasonably incurred and specifies the period to which the statement relates.
(2) A fee charged under this regulation must be paid on or before the 30th day after the date of the invoice that the Safety Authority has sent or given to the person who is required to pay the fee, or on such later day as the Safety Authority has specified.
(3) A fee that has not been paid in accordance with paragraph (2) is recoverable as a civil debt.
(4) Failure to pay a fee does not constitute an offence.
(5) This regulation does not apply where the Intergovernmental Commission is the Safety Authority.