Any notice or other document which a board are required or authorised to give, make or issue by or under this Act or any other enactment may be signed on behalf of the board by the proper officer of the board or by any other officer authorised by them in writing to sign documents of the particular kind or, as the case may be, the particular document and may be withdrawn by notice similarly authenticated, and any document purporting to bear the signature of the proper officer of the board, or of a person expressed to be duly authorised by them to sign such a document, or that particular document, shall be deemed, until the contrary is proved, to be duly given, made or issued by authority of the board.

In this paragraph the expression “signature” includes a facsimile of a signature by whatever process reproduced.

Where any enactment or instrument made under an enactment makes, in relation to any document or class of documents, provision with respect to the matters dealt with by one of the two foregoing sub-paragraphs, that sub-paragraph shall not apply in relation to that document or class of documents.