25. (1) The Implementation Group shall hold such and so many meetings as may be necessary for the performance of its functions and may, subject to the provisions of this Part, make such arrangements for the conduct of its meetings and business as it considers appropriate.

(2) The quorum for a meeting of the Implementation Group shall be 8.

(3) Subject to subsection (2), the Implementation Group may act notwithstanding one or more than one vacancy among its membership.

(4) At a meeting of the Implementation Group—

(a) the chairperson of the Implementation Group shall, if present, be the chairperson of the meeting, or

(b) if and so long as the chairperson of the Implementation Group is not present, or if that office is vacant, the members of the Implementation Group who are present shall choose one of their number to be the chairperson of the meeting.