7 Contributions by holders of a licence (other than a SBA)
The holder of a licence (other than a SBA) must within six weeks of the end of each payment period pay to the CAA (or to such other person as the CAA may direct) the sum resulting from multiplying—
(a) the number of passengers included in relevant bookings under the licence during that payment period; by
(b) the rate of contribution in force at the beginning of that payment period.