10. Subject to paragraph 11 of this Schedule–
(a)the charge prescribed under paragraph 4 of this Schedule shall be payable on the expiry of a period of 28 days beginning on the date on which notice of the estimated 2005 emissions or, where paragraph 9 applies in relation to the installation, the estimated annual specified emissions and the charge is sent by the regulator to the operator;
(b)the charge prescribed under paragraph 5 of this Schedule shall be payable on the expiry of a period of 28 days beginning on the date on which notice of the charge and, in relation to a charge for a financial year in which paragraph 9 applies in relation to the installation and the following financial year, the estimated annual specified emissions, is sent by the regulator to the operator.