2E+W+SUntil 1st January 1978, section 12(2) does not apply to any organisation of members of the teaching profession where at the passing of this Act—
(a)the organisation is an incorporated company with articles of association, and
(b)the articles of association restrict membership to persons of one sex (disregarding any minor exceptions), and
(c)there exists another organisation within paragraphs (a) and (b) which is for persons of the opposite sex and has objects, as set out in the memorandum of association, which are substantially the same as those of the first mentioned organisation, subject only to differences consequential on the difference of sex.