(1) For the purposes of article 11 of Schedule 1, the parties shall be taken as having agreed on the procedure for appointing the arbitrator or arbitrators set out in subclauses (2) to (5), unless the parties agree otherwise.
(2) In an arbitration with 3 arbitrators and 2 parties, each party shall appoint 1 arbitrator, and the 2 arbitrators thus appointed shall appoint the third arbitrator.
(3) In an arbitration with—
the parties shall agree on the person or persons to be appointed as arbitrator.
(4) Where, under subclause (2) or subclause (3), or any other appointment procedure agreed upon by the parties,—
(c) a third party, including an institution, fails to perform any function entrusted to it under such procedure,—
any party may, by written communication delivered to every such party, arbitrator or third party, specify the details of that person’s default and propose that, if that default is not remedied within the period specified in the communication (being not less than 7 days after the date on which the communication is received by all of the persons to whom it is delivered), a person named in the communication shall be appointed to such vacant office of arbitrator as is specified in the communication, or the arbitral tribunal shall consist only of the person or persons who have already been appointed to the office of arbitrator.