(1) Where the basis of calculation of retirement benefit provided by a pension scheme is altered from a defined benefit basis to a defined contribution basis after the date of the decree the designated benefit payable from that pension scheme shall be calculated on a defined benefit basis in accordance with the relevant regulations of this Part.
Provided that where:
(i) resources have been allocated on a defined contribution basis, on behalf of the member spouse, in lieu of retirement benefit previously calculated on a defined benefit basis; and
(ii) the resources allocated are not less than the actuarial value of the retirement benefit which would have been payable to, or in respect of, the member spouse under the pension scheme had his reckonable service terminated on the date that the basis of calculation of retirement benefit was altered from a defined benefit basis to a defined contribution basis,
the designated benefit in respect of such retirement benefit may, if the trustees of
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