For obvious reasons, a trust cannot be formed where a person is both sole trustee and sole beneficiary. Such a person would hold both the legal and the equitable interest, so there would be nothing held in trust.
My question is, what happens if this situation comes about after the trust if formed? E.g. A is sole beneficary and A and B together are the trustees, but then B dies or resigns. Does the trust automatically collapse since A now holds both the legal and equitable interest? Related, is there automatic vesting of the trust property in A if B dies (as opposed to resigns)? Section 40 of the Trustee Act 1925 seems to be silent on this point.