Paragraph 4

A person applying in respect of a service mentioned in paragraph 2(1)(a) or (c) must, before commencement of the work, pay a deposit on account of the fee calculated by reference to an estimate of the duration of the work likely to be required and the standard hourly rate.

The amount of deposit is subject to review during the course of the work, and the applicant must pay any additional sum calculated by reference to any increased estimate of the work likely to be required.

At the conclusion of the work, the fee is to be recalculated by reference to the actual duration and the difference is to be paid by, or as the case may be, refunded to, the applicant.