Shares in insurance firms Admiral Group Plc (LSE:ADM) and Direct Line Insurance Group PLC (LSE:DLG) slumped on Thursday as speculation arose of a regulatory clampdown on premium finance products The insurance regulation chief of the Financial Conduct Authority described such products as "poor" in an interview with trade magazine Insurance Post. FCA insurance head Matt Brewis dubbed the products as "a tax on being poor" and said regulator had "talked about it enough" in an apparent prelude to regulatory action.