sorry for the delay in responding to your question.
Has the Separation Agreement been registered? If so, then he cant demand a final settlement from you, as the finances have already been agreed upon in a legally binding document.
If you are divorcing on the grounds of unreasonable behavior, adultery or one year's non-cohabitation, then he has a right to defend the divorce action and not consent to it. If its on the grounds of 2 year's non-cohabitation, then his consent isn't required.