18. The validity of anything done by the Authority, or by any sub-committee of the Authority, is not affected by any of the following—
(a)any vacancy in the office of chair or vice-chair;
(b)any deficiency in the total number of members of the Authority or sub-committee;
(c)any deficiency in the number of council members or general members;
(d)any vacancy in the office of additional member;
(e)any defect in a person’s appointment as the chair or vice-chair or as a member of the Authority or sub-committee.