The appellant submits that the discretion to award or not to award costs must be exercised judicially according to well settled principles. Unless there be reasons of a recognized kind for providing otherwise, a successful litigant, according to such principles, should have his costs: and the appellant points out that in Western Australia the amount of the professional fees allowable is determined by Order LXV of the Supreme Court Rules which scales the allowance of the major items according to the amount recovered and not according to the amount claimed. Thus an award for costs to a partially successful claimant results in an appropriate recovery of professional fees according to Order LXV and its schedule. So much may be conceded. But none the less, where, as here, there are a number of claims upon some of which the claimant succeeds wholly or partially and upon some of which he fails altogether, it may well be a judicial exercise of the discretion to order each party to bear its own costs throughout. It cannot be said that in such a case the claimant must be given his costs or some part of them. It may be in general he would. But, if he is given costs, it is the result of the exercise of a discretion and not by rule of law. In short, the face of the award does not suggest, let alone demonstrate, a total lack of circumstance in the conduct or result of the arbitration upon or in respect of which the arbitrator could properly exercise his discretion by awarding each party to pay its own costs. In our opinion, it is not made to appear from the award that there was no tenable reason for the arbitrator to depart from the course of awarding costs to the successful party. No doubt there must be such a reason for making the award as to costs which the arbitrator made in this case. The warnings to arbitrators in this respect have been many, see for example the two cases cited here by the appellant's counsel: Smeaton Hanscomb & Co. Ltd. v. Sassoon I. Setty, Son & Co. [No. 2] [1] ; Lewis v. Haverfordwest Rural District Council [2] .