 The rights of individual beneficiaries under a discretionary trust being uncertain, it was open to question to what extent the beneficiaries of a discretionary trust (if all of adult age and sound mind) could utilise the rule in "Saunders v Vautier".It had been held that beneficiaries under a discretionary trust could do so, although that authority was decided pre-"McPhail v Doulton", where to be valid the trustees had to be able to draw up a "complete list" of beneficiaries.That notwithstanding, leading commentators have suggested that provided all of the beneficiaries could be ascertained, they should still retain the right to terminate the trust under the rule, so long as it is an exhaustive discretionary trust.