The applicants now apply, on motion, for an order pursuant to the "slip rule" (O. 29, r.11) that there be included in the orders of this Court pronounced on 28 October 1981 . . . We have no doubt that, if the matter had been adverted to in this Court and this Court possessed power to make such an award of interest, it would have made it.
After considering the power to order the payment of interest, the judgment continues:
It follows from the foregoing that, but for the inadvertence of counsel for the applicants, this Court would have made provision, in the substituted judgment of Waddell J., for interest on the damages in respect of the relevant period. We turn to a consideration of the question whether it is competent for the Court to make good the omission on the present application.
Order 29, r. 11 is in the traditional form of a slip rule. It reflects the inherent jurisdiction of a court "at any time to correct an error in a decree or order arising from a slip or accidental omission" (see Milson v. Carter ([1893] A.C. 638 at p.640). In terms, the rule provides, inter alia, that "an error arising in a judgment or order from an accidental slip or omission, may at any time be corrected by the Court or a Justice on motion or summons". The rule extends to authorize an omission resulting from the inadvertence of a party's legal representative (see Fritz v. Hobson ((1880) 14 Ch.D. 542 at pp.561-562); Chessum & Sons v. Gordon ([1901] 1 KB 694 at p.698); In re Inchcape (Earl) ([1942] Ch.394, at pp.397-398); Coppins v. Helmers & Brambles Constructions Pty Ltd. ([1969] 2 NSWLR 279 at pp.281-282); Tak Ming Co. Ltd. v. Yee Sang Metal Supplies Co. ([1973] 1 WLR 300 at p.304; [1973] 1 All ER 569 at p.571). This is so, regardless of whether the order has been drawn up, passed and entered (see Milson v Carter ([1893] AC at p.640); Fritz v Hobson ((1880) 14 Ch.D. at p.560).