If, in relation to the
presiding member of a committee —
(a) the
office of presiding member and the office of deputy presiding member are
vacant; or
(b) the
presiding member and the deputy presiding member, if any, are not available or
are unable or unwilling to perform the functions of presiding member,
then the committee
members present at the meeting are to choose one of themselves to preside at
the meeting.