"This, while there is a strong contract-like basis for gratuitous families trusts to be regarded as 'deals' made with trustees for the benefit of the beneficiaries, any provisions apparently reducing the deal, instead, to one for the benefit of the turstees or the settlor (or protector), entitled in default of the trustees exercising inherently revocable powers in favour of objects specified by the settlor, must either be struck out as inconsistent with, or repugnant to, the original deal for the benefit of the beneficiaries or be implemented as the real deal."
Fundamental level of obligation needed for trust - can change but can't remove the "irreducible core"