This section applies where any enactment (including an order under this Act) provides that a named Secretary of State and his successors shall be a corporation sole, and applies whether or not the office of corporation sole is for the time being vacant.

Anything done by or in relation to any other Secretary of State for the named Secretary of State as a corporation sole shall have effect as if done by or in relation to the named Secretary of State.

Without prejudice to the preceding provisions of this section, any deed, contract or other instrument to be executed by or on behalf of the named Secretary of State as a corporation sole shall be valid if under the corporate seal of that Secretary of State authenticated by the signature of any other Secretary of State, or of a Secretary to any department of a Secretary of State, or of a person authorised by any Secretary of State to act in that behalf.