Arbitration Act (Cap. 387), article 25

25. (1) A party who intends to challenge an arbitrator, shall send notice of his challenge within fifteen days after the appointment of the challenged arbitrator has been notified to t hat party or within fifteen days after the circumstances mentioned in article 23 and 24 became known to that party. (2) The challenge shall be notified to the registrar, to the oth er party, to the arbitrator who is challenged and to the other mem bers of the arbitral tribunal. The notification shall be in writing and shall state the reasons for the challenge. (3) When an arbitrator has been challenged by one party the other party may agree to the challenge. The arbitrator may also , after the challenge, withdraw from his office. In neither case does this imply acceptance of the validity of the grounds for the challenge. In both cases the procedure provided in articles 20 and 21 shall be used in full for the appointment of the substitute arbitrator even if during the process of appointing the challen ged arbitrator a party had failed to exercise his right to appoint or to participate in the appointment. 14 CAP. 387.] ARBITRATION Non-withdrawal of challenged arbitrator.