Subject to subsection (2) of this section, no person shall be under any duty, whether by contract or by any statutory or other legal requirement, to participate in any treatment authorised by this Act to which he has a conscientious objection:

Nothing in subsection (1) of this section shall affect any duty to participate in treatment which is necessary to save the life or to prevent grave permanent injury to the physical or mental health of a pregnant woman.

In any proceedings before a court in Scotland, a statement on oath by any person to the effect that he has a conscientious objection to participating in any treatment authorised by this Act shall be sufficient evidence for the purpose of discharging the burden of proof imposed upon him by subsection (1) of this section.