[53] The respondents, as registered transferees of the mortgages, hold indefeasible titles to their interests. In R. Derham, The Law of Set-Off (3rd ed., 2003) it is pointed out, on the authority of Long Leys Co Pty Ltd v. Silkdale Pty Ltd (1991) 5 BPR 11,512 at 11,519-11,520, however, that the principle of indefeasibility of title is separate from, and does not affect, the principle that the transferee of a Torrens system debt takes subject to set-offs available to the transferor, and that therefore, where an equitable set-off would have provided a defence to the mortgagor to an action for possession by the original mortgagee, the defence should be equally available as against a transferee of the mortgage : para. 17.72, p.831. It was not in issue before us that the indefeasibility of the respondents' titles was a matter separate from the question of the state of the accounts between the appellant and the original mortgagee. As to the second proposition, however, the rights of the appellant are of course to be determined subject to the rule applied in Inglis v. Commonwealth Trading Bank of Australia. But that rule relates only to interlocutory relief and it does not follow that the claimed set-offs cannot be pursued. They may be; and, when adjudicated upon, may become liquidated sums available to be set off against the mortgage debts: see Derham, para. 4.99, pp. 139-140 where Newman v. Cook [1963] VicRp 91; [1963] VR 659 is referred to; see also Popular Homes Ltd v. Circuit Developments Ltd [1979] 2 NZLR 642.