Section 18

The common seal of the Board shall be in the custody of the Chairman and shall not be used except in the presence of the Chairman or Deputy Chairman and one member and such use shall be authenticated by the signatures of such persons and such authentication shall be sufficient evidence that such seal was duly and properly fixed and that it is the lawful seal of the Board.

All documents, other than those required by law to be under seal, to which the

Board is a party may be signed on behalf of the Board by the Chairman or any member or by any officer or servant generally or specially authorised in that behalf by the Board.

Vacancy not to invalidate acts, etc..