6(1)On 1st January 1992, and at the end of each succeeding period of five years commencing on that date, the following members of the Council shall retire, that is to say—
(a)two of the members nominated by the Privy Council under paragraph 1(a) above, neither of them being the person appointed as specially qualified to advise on educational problems generally;
(b)those chosen to represent registered opticians; and
(c)the four ophthalmologists nominated by the College of Ophthalmologists.
(2)All the members who do not retire under sub-paragraph (1) above shall retire on lst January 1994 and at the end of each succeeding period of five years commencing on that date.
(3)Elections or nominations required to fill any vacancy occurring at the end of any period shall, so far as is practicable, be held or made before the end of that period.