At any meeting of the Commission F1, including any hearing under section 103 of this Act, the quorum shall be F2four or such larger number as the Commission may determine.

In the case of an equality of votes at any meeting of the Commission the person acting as chairman of the meeting shall have a second or casting vote.

The proceedings of the Commission shall not be invalidated by any vacancy in their membership or by any defect in the appointment of any person as a member, or as chairman or deputy chairman, of the Commission.

Subject to the foregoing provisions of this paragraph, the Commission shall have power to regulate their own procedure.