a person shall be deemed not to have validly given or withdrawn his consent to a fertilisation procedure, whether done in Singapore or elsewhere, unless he gives or withdraws his consent, as the case may be, in writing; and
(b)
unless the contrary is proved, a person shall be presumed to have validly given or withdrawn his consent to a fertilisation procedure done in Singapore if he gives or withdraws his consent, as the case may be, to the fertilisation procedure —
(i)
in writing; and
(ii)
in accordance with any law or any condition imposed pursuant to any law, or any requirement or procedure imposed by the responsible authority, in respect of that fertilisation procedure.