6 The costs of proceedings for the redemption or apportionment of a corn rent annuity under the statutory provisions referred to shall be borne by the applicant therefor, unless the Commission consider that the conduct of any other party has been unreasonable or that any other party has unreasonably refused a proposal made by such applicant, or unless the circumstances of the case are, in the opinion of the Commission, exceptional, in any of which cases the Commission may give such direction as to the payment of the whole or any part of the costs as they may consider just.