17.4 All rights and obligations of the Parties shall cease to have effect hereunder immediately upon termination of this Agreement except that termination shall not affect:
(a) the accrued rights and obligations and liabilities of the Parties at the date of termination under this Agreement; and
(b) the continued existence and validity of the rights and obligations of the Parties under those clauses which are expressed to survive termination and any provisions of this Agreement necessary for the interpretation or enforcement of this Agreement.