8.—(1) On a casual vacancy occurring in the office of chair or vice-chair of the Authority, the vacancy shall be filled by the Authority at a meeting held as soon as practicable after the vacancy occurs.
(2) A member appointed under this paragraph to fill a casual vacancy in the office of chair or vice-chair shall, unless he resigns that office or ceases to be a member, hold that office during the remainder of the term for which the chair or vice-chair whom he replaces was appointed.