Cameron v Murdoch (1986) 63 A.L.R. 575
Proprietary estoppel can be enforced even though the interest is inchoate.
Facts
The facts occurred in Western Australia. Some family members claimed shares in a partnership farming business which had been carried on for 43 years after the death of the senior partner (the father of the other two partners) with no final settlement of accounts. After the two sons died the family members sought a final settlement of the accounts.
Issues
The debate was whether the sons were trustees for the father’s estate for the share of the profits that were attributable to the use of the father’s original share in the partnership assets. There was also a debate over whether such a right could be transferred to a third party as it had yet to be defined and was ‘inchoate’.
Decision/Outcome
The Privy Council held that the father’s estate was not entitled to a one third share in any new land bought by the partnership after his death, or to hold that the surviving partners were trustees, as this would have been inconsistent with s.42 of the New South Wales Partnership Act 1892 (s.55 in Western Australia) which provided set remedies. However, the court also held that a person’s successor in title could sue for equitable rights. A proprietary estoppel was brought into being as soon as a landowner acted unconscionably and could be enforced from that time. The exact nature of the expectation or right need not be expressed provided the claimant believed he would be entitled in some way during the due course of time.
Updated 21 March 2026
This case summary remains broadly accurate as a description of the Privy Council’s decision in Cameron v Murdoch (1986) 63 ALR 575. The core principle — that a proprietary estoppel can arise and be enforced even where the precise interest is not yet defined (i.e. is inchoate), and that a successor in title may sue on equitable rights — continues to be recognised in both Australian and English equity jurisprudence.
Readers should note that this is an Australian Privy Council case decided under Western Australian and New South Wales partnership legislation. The relevant statutory provisions discussed are those of Australian law and are not directly applicable in England and Wales. In the English context, partnership remedies are governed by the Partnership Act 1890. The proprietary estoppel principles discussed are broadly consistent with the English approach as developed through cases such as Thorner v Major [2009] UKHL 18 and Guest v Guest [2022] UKSC 27, the latter of which contains important Supreme Court guidance on the remedy for proprietary estoppel. Students should be aware that Guest v Guest represents a significant modern development in English law on this topic and should be read alongside this case summary.
