No Member of the said Harbour Board shall enjoy any Office or Place of Profit under this Act; and no such Member shall directly or indirectly by himself or his Partner have any Share or Interest in or be in any Manner concerned in any Contract or Bargain relating to any Works to be ordered, done, or executed under the Provisions of this Act or any other Act, or any Charter, relating to Dover Harbour, or in the Execution of any such "Works, or in the supplying of any Materials for any such Works, or for the Use of the said Harbour or Board ; and if any Member of the said Board shall disobey this Enactment, every such Member so offending shall for every such Offence forfeit and pay the Sum of One hundred Pounds to any Person or Persons who shall sue for the same, and shall, upon being convicted of any such Offence, become then and be for ever afterwards incapable of being or acting as a Member of the said Board ; and no such Contract or Bargain as aforesaid, which any such offending Member has entered into contrary to the Intent of this Enactment shall be enforced against the said Board : Provided nevertheless, that all Acts and Proceedings of any Person acting as a Member of the said Board previous to his being convicted of any such Offence, shall, notwithstanding such Conviction, be good, valid, and effectual.