(1) The energy ombudsman must at least 14 days, but no more than 1 month, before the end of each quarter--
(a) work out, under section 69, the user-pays fee for the next quarter payable by each energy entity who is then a scheme member; and
(b) give the scheme member an invoice for the fee.
(2) If an energy entity becomes a scheme member during a quarter, the energy ombudsman must--
(a) work out, under section 69, the user-pays fee payable by the scheme member for the period (the part quarter) from when the entity became a scheme member to the end of the quarter; and
(b) give the scheme member an invoice for the amount of the fee for the part quarter.
(3) For applying section 69 for the part quarter, a reference in section 69 to the assessed quarter is taken to include a reference to the part quarter.
(4) The user-pays fee for the next quarter or part quarter is payable 14 days after the scheme member receives the invoice.