(1) This section shall apply as respects chargeable gains accruing to the trustees of a settlement where the trustees are not resident and not ordinarily resident in the State, and where the settlor or one of the settlors is either resident or ordinarily resident in the State, or was either resident or ordinarily resident in the State when such settlor made the settlement.
(a) Any beneficiary under the settlement who is domiciled and either resident or ordinarily resident in the State in any year of assessment shall be treated for the purposes of the Capital Gains Tax Acts as if an apportioned part of the amount, if any, on which the trustees would have been chargeable to capital gains tax under section 31, if domiciled and either resident or ordinarily resident in the State in that year of assessment, had been chargeable gains accruing to the beneficiary in that year of assessment.
(b) Notwithstanding paragraph (a), where a beneficiary under the settlement was neither resident nor
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