Prospective
3N.I.The official mark on the ballot paper of those voting in respect of a constituency at a special polling station—
(a)shall be different from the official mark on the ballot papers of those voting at the same election in respect of the constituency at polling stations allotted to them under the parliamentary elections rules, and
(b)shall be kept secret;
and an interval of seven years shall intervene between the use of the same official mark on ballot papers of those voting at special polling stations.