(1) The court may order the party on whose behalf a subpoena was issued to pay the amount of any reasonable loss or expense incurred by the person to whom the subpoena is directed in complying with the subpoena.
(2) An order made under subrule (1) must fix the amount payable or direct that it be fixed by assessment.
(3) An amount fixed under this rule is in addition to—(a) any amount payable under rule 419 ; and(b) any amounts payable as an attendance allowance.