Actually, let me clarify for you. As a matter of record I wanted you not to keep calling him a Director as he is not a member of the Board.
However, if someone acts as a Director, yet is not a member of the Board, he or she may be deemed to be acting a "shadow director" and therefore face all directoral responsibilities and liabilities.
A shadow director in relation to a company means a person in accordance with whose directions or instructions the directors of the company are accustomed to act (section 251(1), 2006 Act). This definition is also followed in section 251 of the Insolvency Act 1986 (IA 1986) and section 22(5) of the Company Directors Disqualification Act 1986 (CDDA 1986).