Regulation 18 Under-payments in respect of levy: action by licensed supplier
If at any time any licensed supplier has reason to believe that the payment, or the aggregate of the payments, made in respect of the levy by him pursuant to regulation 11(3) is less than it should have been, he shall serve notice on the Director setting out—
his reason or reasons for the belief;
the amount which he believes he should have paid and the manner in which that amount has been calculated,
and with his notice the licensed supplier shall pay to the Director the difference between the amount which he has paid and the amount set out in that notice (together with an amount in respect of interest in accordance with regulation 24(1)).
No notice under paragraph (1) may be served after the expiry of a period of 3 years commencing on the last day of whichever of the periods specified in regulation 11(3)(a) and (b) is the period in question.