6If a member of the Board—
(a)is detained for more than seven days in any place under any enactment in force in the United Kingdom relating to persons of unsound mind ;
(b)becomes bankrupt or enters into a composition or arrangement with his creditors;
(c)is convicted of a contravention of section 42 of this Act; or
(d)is absent from six consecutive meetings of the Board except for some reason appearing to the Board to be sufficient excuse ;
the Board shall forthwith declare his office to be vacant and his office shall become vacant on the date of the declaration.