# Arbitration (International Investment Disputes) Act 1966, Article 37


(1) The Arbitral Tribunal (hereinafter called the Tribunal) shall be constituted as soon as possible after registration of a request pursuant to Article 36.
(2) (a) The Tribunal shall consist of a sole arbitrator or any uneven number of arbitrators appointed as the parties shall agree.
(b) Where the parties do not agree upon the number of arbitrators and the method of their appointment, the Tribunal shall consist of three arbitrators, one arbitrator appointed by each party and the third, who shall be the president of the Tribunal, appointed by agreement of the parties.

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Source: https://www.legislation.gov.uk/ukpga/1966/41/schedule/part/5/chapter/2/crossheading/article-37 (the official version)
Page: https://openlegislation.uk/arbitration-international-investment-disputes-act-1966/schedule/part-5/chapter-2/crossheading-article-37
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.