(1)The Governor-General in Council and the Governor-General, both as respects matters with respect to which he is required by or under this Act to act in his discretion and as respects other matters, shall be under the general control of, and comply with such particular directions, if any, as may from time to - time be given by, the Secretary of State, but the validity of anything done by the Governor-General in Council or the Governor-General shall not be called in question on the ground that it was done otherwise than in accordance with the provisions of this subsection.