The Judicial Committee of the Privy Council as formed under the provisions of the first section of the Act of the third and fourth William the Fourth, chapter forty-one, intituled " An Act " for the better administration of Justice in His Majesty's Privy " Council," shall include such members of Her Majesty's Privy Council as are for the time being holding or have held any of the offices in the Appellate Jurisdiction Act, 1876, and this Act, described as high judicial offices.