(1)Subsection (1)(a) of section 1 shall not render unlawful the performance of a surgical operation if that operation—
(a)is necessary for the physical or mental health of the person on whom it is performed and is performed by a registered medical practitioner; or
(b)is performed on a person who is in any stage of labour or has just given birth and is so performed for purposes connected with that labour or birth by—
(i)a registered medical practitioner or a registered midwife; or
(ii)a person undergoing a course of training with a view to becoming a registered medical practitioner or a registered midwife.
(2)In determining for the purposes of this section whether an operation is necessary for the mental health of a person, no account shall be taken of the effect on that person of any belief on the part of that or any other person that the operation is required as a matter of custom or ritual.