Regulation 10 Cessation of membershipI1

he has ceased to be a member of the authority;

he has notified the proper officer in writing that he no longer wishes to be treated as a member of the group;

there is delivered to the proper officer a notice under regulation 8 or 9(b) signed by the person whereby a new political group is constituted or he joins another political group; or

there is delivered to the proper officer a notice in writing signed by the majority of the members of the group stating that they no longer wish him to be treated as a member of it.