If an appointing body is satisfied that a member whom they have appointed to the Authority—
(a)has without the permission of the Authority been absent from the meetings of the Authority—
(i)during a period when three such meetings have been held; or
(ii)for a period of three consecutive months;
whichever of those periods is the longer; or
(b)has become bankrupt or made an arrangement with his creditors; or
(c)is incapacitated by physical or mental illness from discharging the functions of a member; or
(d)is otherwise unable, unwilling or unfit to discharge the functions of a member;
the appointing body may declare his office as a member to be vacant and thereupon his office shall become vacant.