Restriction on the summoning of officers and servants of the Board and Planning Authority

No chairman, member or officer or servant of the Board or any planning authority shall in any legal proceeding to which the Board or planning authority is not a party, be required to produce any register or document the contents of which can be proved under the preceding section by a certified copy or to appear as a witness to prove the matters and transactions recorded therein, except by an order of the Court made for special cause.