"2(1)(a) a woman may elect not to be and thereafter (subject to the provisions of paragraph (2) of this regulation) shall not be liable to pay contributions…. in respect of any employment as an employed person for any period during which she is married. …….. (2)(a) any such election by a married woman not to pay contributions as an employed person may be made by her at any time by giving notice in writing to the Secretary of State to that effect, and the election shall be operative from the beginning of the week next but one following the week in which the notice was given from such early a date as the Secretary of State may allow." 9. The Department of Health and Social Security issued a leaflet NI 1 "