If a registered society has an official seal, it may authorise any person appointed for the purpose as respects any territory, district or place appearing on the face of that seal to affix it to any deed or other document to which the society is party there.
An authorisation for the purposes of subsection (1) must be given—
in the case of a society whose registered office is in Scotland, by writing subscribed or authenticated in accordance with the Requirements of Writing (Scotland) Act 1995;
in any other case, by writing under the society's common seal.
As between the society and a person dealing with such an agent, the agent's authority continues—
if a period is mentioned in the authorisation, during that period, or
if no period is mentioned there, until notice of the revocation or determination of the agent's authority has been given to the person dealing with the agent.
The person affixing the official seal must certify in writing on the deed or other instrument to which the seal is affixed the date on which and the place at which it is affixed.