4 Given that this notice of motion is seeking to vary orders which are sealed and final it is important to clarify the basis on which I can intervene, if at all. Generally the only basis for challenge will be by way of an appeal under s 56A of the Land and Environment Court Rules 1996 ("the Court Rules") apart from limited arguments related to the application of the Court Rules. The Applicant bases its motion on a number of grounds under the Rules and the Land and Environment Court Act 1979 ("the Court Act"). The motion is not framed as a s 56A appeal raising questions of law. The Applicant's arguments are as follows:
(a) The "slip rule", developed in Ervin Mahrer & Partners v Strathfield Council [2002] NSWLEC 97, and which is set out in Pt 10 r 7(1) of the Court Rules should apply.
(b) That the entry of the order by the Registrar was invalid, since it occurred prior to the order being given, and therefore can be set aside under Pt 15 r 9(b) of the Rules.
(c) That the Respondent had originally consented to the making of an order that costs be reserved, and therefore, Pt 15 r 9(f) applies to give the Court power to set aside an order.
(d) That under s69(8) of the Court Act, the Commissioner did not have power to make an order on costs without the concurrence of the Chief Judge, which did not occur in this case.
(e) That by perfecting the order, the Registrar made it in the absence of a party, rendering Pt 15 r 9(a) of the Rules applicable
(f) That there was non-compliance with Clause 10 of the Practice Direction 1993, as was then in force
(g) That the Court has the power to vary the order under the principles of Logwon Pty Ltd v Warringah Shire Council (1993) 33 NSWLR 13.
(a) Slip rule
5 The Applicant's primary argument is that the slip rule should be applied in these circumstances. Part 10 r 7 provides that:
If there is a clerical mistake, or an accidental error or omission, in a judgment or order, or in a certificate, the Court, on the application of any party or without any such application, may, at any time, correct the mistake or error.