4. In proceedings before a court, a question shall only be admissible as evidence in pursuance of sections 65(2)(a) of the Act—
(a)where it was served before those proceedings had been instituted, if it was so served during—
(i)the period of six months beginning when the act complained of was done, or
(ii)in a case to which section 57(5) of the Act applies, the period of eight months so beginning;
(b)where it was served when those proceedings had been instituted, if it was served with the leave of, and within a period specified by, the court.