23. Appointment of substitute arbitrator
(1) Where the mandate of an arbitrator terminates under section 21 or section 22 or because of his withdrawal from office for any other reason or because of the revocation of his mandate by agreement of the parties or in any other case of termination of his mandate:
(a) subject to any process agreed between the parties in the arbitration agreement, or thereafter, the parties may agree with the arbitrator as to his liabilities and entitlement (if any) to fees and expenses; and
(b) a substitute arbitrator shall be appointed according to the rules that were applicable to the appointment of the arbitrator being replaced, unless otherwise agreed by the parties.
(2) If, or to the extent that, there is no agreement in accordance with subsection (1)(a) as to the consequences of resignation, an arbitrator who resigns in the circumstances set out in subsection (1) may, upon written notice to the parties, request the arbitral institution administering the arbitration, or, where there is no such institution, the Court to make an order relieving him of any liability incurred by reason of his resignation together with such order as the arbitral institution administering the arbitration, or, where there is no such institution, the Court thinks appropriate with respect to his entitlement (if any) to fees and expenses, which orders shall not be subject to appeal.