13. The validity of any proceedings of the Institute, or of any of its committees, shall not be affected by—N.I.
(a)any vacancy among the members of the Institute or of the committee;
(b)any vacancy in the office of the chairman or deputy chairman of the Institute;
(c)any defect in the appointment of any one or more members of the Institute or in the appointment of the chairman or deputy chairman of the Institute; or
(d)any failure to comply with paragraph 12.