Paragraph 12
Where the Secretary of State revises a determination as to amount under paragraph 11, the Secretary of State must notify the person in respect of whom the determination as to amount was made that the Secretary of State has made such a revision, specifying—
the amounts payable to that person for income losses and (as the case may be) for each of the non-income losses, as well as the total amount payable to that person, as calculated in accordance with regulation 6 (“the revised amount”);
the reasons for any difference between the revised amount and the corresponding amount in the determination as to amount that was the subject of the revision (“the original amount”); and
if there is a difference as referred to in sub-paragraph (b) and the Secretary of State has paid the original amount to that person-
in the case of the revised amount exceeding the original amount, the amount by which the revised amount exceeds the original amount (“the underpayment amount”); and
in the case of the original amount exceeding the revised amount, the amount by which the original amount exceeds the revised amount (“the overpayment amount”).