The tribunal may make an award allocating the costs of the arbitration as between the parties ....
It is irrelevant for the purposes of subsection (1) whether the tribunal has ruled, or a court has held, that the tribunal has no substantive jurisdiction or has exceeded its substantive jurisdiction.
... The tribunal shall award costs on the general principle that costs should follow the event except where it appears to the tribunal that in the circumstances this is not appropriate in relation to the whole or part of the costs.
Subsections (1), (1A) and (2) are subject to any agreement of the parties.