Re Gestetner Settlement [1953]

The ‘is or is not’ test for certainty of objects for
those with powers of appointment was born.
Since the power-holder has no duty to distribute
property, all that matters is misfeasance.
Ie If he appoints property at all he must be sure to
appoint only to those within the class of objects.
Does not need complete list of objects.
Merely needs to know with certainty whether a particular
person is within class or not.