15 The arbitral tribunal.E+W+N.I.
(1)The parties are free to agree on the number of arbitrators to form the tribunal and whether there is to be a chairman or umpire.
(2)Unless otherwise agreed by the parties, an agreement that the number of arbitrators shall be two or any other even number shall be understood as requiring the appointment of an additional arbitrator as chairman of the tribunal.
(3)If there is no agreement as to the number of arbitrators, the tribunal shall consist of a sole arbitrator.