4. The appropriate officer must allow such disbursements claimed under paragraph 2 as appear to the appropriate officer to have been reasonably incurred, provided that—
(a)if they are abnormally large by reason of the distance of the court or the assisted person's residence or both from the litigator's place of business, the appropriate officer may limit reimbursement of the disbursements to what otherwise would, having regard to all the circumstances, be a reasonable amount; and
(b)the cost of a transcript, or any part thereof, of the proceedings in the court from which the appeal lies obtained otherwise than through the registrar must not be allowed except where the appropriate officer considers that it is reasonable in all the circumstances for such disbursement to be allowed.