“If parties agree to compromise judicial review proceedings on terms that costs be dealt with on written submissions by the Administrative Court, it is inappropriate for a dissatisfied party to apply for permission to appeal. This court is not in the business of hearing oral argument for the first time in relation to what is a paradigm example of discretionary decision. If the incidence of costs is not important enough for oral argument at first instance, it is neither important enough nor proportionate for there to be an appeal.”