Revocability
Another issue as regards mutual wills is the question of revocability. In Re Hobley Charles Aldous QC held that there could be either unilateral or mutual revocation provided it occurred during the lifetime of both testators. However, the problem with this approach is that unilateral revocation is against the general principle of contract. Several explanations for this could be proffered. Firstly, there could be an implicit term that the agreement is revocable. Secondly, it could be conceptually viewed that the agreement takes on the revocable nature of the will to which it relates. Thirdly, as the doctrine is based on detrimental reliance, the agreement only concretized on the death of the other party. Fourthly, one could apply the unconscionability rationale that unjust enrichment could only be complete when one party takes a benefit under the will of the other party.
Re Hobley adopts the unconscionability rationale such that the imposition of a constructive trust is only justified by unconscionability, therefore there must be detrimental reliance. This would appear to be analogous to the doctrine of estoppel. Another consequence of this approach is that the trust must come into existence before the death of the first testator as otherwise the subject matter of the trust would be uncertain and could possible be avoided by inter vivos dispositions.
Another point of controversy was whether or not the second testator had to benefit from the initial disposition. Commentators had argued that this was the case as if the second testator did not benefit the unjust enrichment argument would be untenable. However, Re Dale Ch held that no benefit was necessary. Morritt J reasoned that although the aim of the doctrine was to prevent fraud on the first testator this did not require a corresponding benefit for the second testator. Friel (1996 1 CPLJ) argued against this saying that the trust should not be imposed on the property but rather on the implementation of the contract between the parties. An excellent rebuke to this approach and support for the view in Re Dale is to be found in the judgment of Rowles JA in the Court of Appeal (British Columbia) decision in University of Manitoba v Sanderson . Rowles contended that the doctrine imposes a constructive trust on the survivor because the first to die is considered to have carried out the agreement by her death in reliance on the survivor's promise to act in accordance with the agreement. It is also important to note that these cases do not use the fraud rationale in the conventional sense of deceptive receipt of property. Instead an estoppel argument based on representation, reliance, detriment and irrevocability is utilised.
Re Hagger 2 Ch held that the constructive trust comes into existence on the death of the first testator, however this approach was revised in Re Hobley which decided that it must come into existence before the death of the first testator to satisfy the requirement of certainty of subject matter.
In the case of Ottaway v Norman Ch., Brightman J held that a floating obligation attaches to secret trusts: "A valid trust is created in favour of the secondary donee which is in suspense during the lifetime of the donee, but attaches to the estate of the primary donee at the moment of the latter's death." Edward Nugee QC sitting as deputy High Court judge in Re Basham 1 WLR applied a comparable test in relation to proprietary estoppel. He held that the belief, for detrimental reliance, need not relate to a clearly identified piece of property. Following Cleaver and Birmingham, if it is established by cogent evidence that the intention was to leave the entire estate, proprietary estoppel will enforce that intention. (It is interesting to recall that Edward Nugee was counsel in Ottaway v Norman and that Brightman J adopted his floating obligation theory)
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