19 There has long been a debate as to whether a constructive trust is a right or a remedy and some commentators draw a distinction between institutional constructive trusts and remedial constructive trusts: see Ford H A J and Lee W A, "Principles of the Law of Trusts", 3rd ed, Law Book Company, Australia, 1996, par 22060. The dichotomy is between those categories of cases where it is practically certain that, if the court were asked to declare that a constructive trust existed, it would do so and other situations capable of leading to a declaration by a court that a constructive trust exists but in respect of which there may be uncertainty as to whether some other equitable remedy might be awarded. Included in the former category are a fiduciary receiving a bribe, a mortgagee who, having sold chattels, holds surplus proceeds after paying expenses and recouping what is owed on the mortgage, the constructive trust affecting a donor of a gift complete in equity and the constructive trust which gives efficacy to an agreement for mutual Wills. In such cases, the predictability of the outcome is such that the constructive trust is said to arise at the time of the relevant conduct and the beneficiary of the trust has a beneficial interest in the trust property from that time which (if the property is land) can be protected by caveat. In these cases, there is an obvious analogy with the equitable proprietary interests that arise when the remedy of specific performance is available such as in the case of a specifically enforceable agreement for the sale of land or an agreement to lease.