7 In Hanson Construction Materials Pty Ltd v Vimwise Civil Engineering Pty Ltd [2005] NSWSC 880; (2005) 12 BPR 23,355, Campbell J (as his Honour then was), observed (at [28]) that whether a caveat adequately describes the estate or interest is to be decided from the point of view of a person examining the caveat, who need not necessarily be the registered proprietor. The caveat in that case identified the nature of the estate or interest in the land claimed by the caveator as "an equitable interest". His Honour observed that an equitable interest in land "could relate to a multiplicity of types of interest", and the caveat failed to comply with fundamental requirements for a caveator fully and properly to describe the interest claimed. His Honour observed that the defect could not be ignored in reliance on s 74L. That decision has, so far as I am aware, been consistently followed. Thus, in Warden v Mortgage House No 1 Pty Ltd [2006] NSWSC 1462; (2006) 13 BPR 24,375, Brereton J said (at [15]):
" ... As Campbell J explained in Hanson Construction Materials Pty Ltd v Vimwise Civil Engineering Pty Ltd [2005] NSWSC 880, a caveat that merely claims 'an equitable interest' is inadequate to specify the interest claimed by the caveator, as required by Real Property Regulation 2003 (NSW), reg 47; Sch 3, Item 1 [see also Circuit Finance Pty Ltd v Crown & Gleeson Securities Pty Ltd (2006) NSW ConvR 56-143]. Mr Warden's caveat provides, as the particulars of the nature of the estate or interest in land claimed, only 'equitable interest', and for the reasons explained in those two cases, that is insufficient. This is not a mere formal requirement; it goes to the heart of the operation of the caveat provisions of the Real Property Act 1900 (NSW), and is not susceptible of being cured under s 74L. Nor is the defect overcome by the statement of the facts said to support the claim, because at the very least, those facts admit of the possibility of a range of different types of 'equitable interest'... "