An arbitrator may not give indirect effect to a void costs clause by treating the parties' supposed common intention (derived from that clause and surrounding history) as a reason to depart from the usual costs rule. Any reason for departing from the rule that costs follow the event must be sufficiently connected with the arbitration proceeding itself. The costs discretion in arbitration, while unfettered, does not extend to reliance on extraneous matters such as pre-contractual negotiations or void contractual provisions.
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