9. If the Trustees are satisfied that a Trustee—
(a)has without the permission of the Trustees been absent from meetings of the Trustees—
(i)for 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,
(b)has become bankrupt or made an arrangement with creditors,
(c)is incapacitated by physical or mental illness from discharging the functions of a Trustee, or
(d)is otherwise unable, unwilling or unfit to discharge the functions of a Trustee,
the Trustees may declare the office of such a person as a Trustee to be vacant and thereupon the office shall become vacant.