[18] Much of the argument advanced by counsel for the respondent was concerned with procedural issues. He submitted that the Registrar, acting as costs assessor, did not have the jurisdiction to determine whether or not the costs agreement was void by operation of s 48F(1) of the Act. The Registrar is given wide powers by r 706, including the power to conduct a hearing, examine witnesses, and require the production of documents. That the Registrar's jurisdiction extends to determining issues of law is made clear by r 717(2)(c); where the Registrar is dealing with an objection he must "concisely state the reasons for the objection identifying any issue of law or fact the objector considers the Registrar must consider to make a decision in favour of the objector." The powers of the Registrar would seem wide enough to cover the situation where the validity of a costs agreement was put in issue. If the Registrar made a decision, one way or the other, and then proceeded to assess costs on that basis, his decision on the validity of the agreement could ultimately be reviewed by a judge pursuant to r 742.