9.—(1) The Department may vary a notice under paragraph 1 so as to—
(a)decrease an amount to be deducted under paragraph 3, or
(b)with the agreement of the liable person, increase an amount to be deducted under paragraph 3 but only to the extent that deductions of the increased amount will result in the employer paying the liable person an amount more than, or equal to, the protected earnings proportion.
(2) Where a notice under paragraph 1 is varied under this paragraph, paragraph 1 applies to the notice as varied as it applies to the original notice; and a reference in this Schedule to the notice is a reference to the notice as varied.
(3) Where a notice as varied is given under paragraph 1, the employer who is liable to make deductions under the notice must comply with the notice as varied from the day it takes effect under that paragraph.