5.—(1) The employer shall, in writing, ask each applicant whether he is Protestant or Roman Catholic or whether he is neither Protestant nor Roman Catholic.
(2) The question referred to in sub-paragraph (1) shall be—
(a)included on or sent with any application form supplied by the employer for the purpose of the application; or
(b)sent to the applicant separately by post and accompanied by a pre-paid envelope addressed to the employer.