(b) where the managing agent is a firm: any member of such firm; any partner or relative of any such member; and any other firm in which any such member, par- tner or relative is a partner; any private company of which the firm first mentioned, or any such member, partner, relat- ive or other firm is the manag- ing agent, or secretaries and treasurers, or a director, or the manager; and any body c