7Rules may—
(a)make provision about the circumstances in which there is a duty to exercise the power under paragraph 5, so far as not relating to rectification;
(b)make provision about how the register is to be altered in exercise of that power;
(c)make provision about applications for alteration under that paragraph, including provision requiring the making of such applications;
(d)make provision about procedure in relation to the exercise of that power, whether on application or otherwise.