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Human Fertilisation and Embryology Bill [HL]

My Lords, is the difficulty of the noble Baroness, Lady Williams, that the embryo has been selected to be a tissue match or would her objections apply equally if a natural-birth second child was found to be a tissue match and there was a wish on the part of the parents—leaving aside the issues of consent for the moment—to ensure that material from the second child, whether bone marrow or whatever, be made available to the first child? Is it the design or the intention that presents her with the greater difficulty, or is it the effect that the second child may indeed turn out to be a tissue match even though it was not so intended?