162. Variation and withdrawal of consent.

162.     Variation and withdrawal of consent.

The terms of any consent to which these provisions apply1 may from time to time be varied, and the consent may be withdrawn, by notice given by the person who gave the consent to the person keeping the gametes, human cells, embryo or human admixed embryo2 to which the consent is relevant3.

Terms of any consent to the use of any embryo cannot be varied, and such consent cannot be withdrawn, once the embryo has been used: (1) in providing treatment services4; (2) in training persons in embryo biopsy, embryo storage or