i dont know much about the law, but surely common sense would say the solicitor is right. You dont want anything more to do with him except as the father as your children, therefore that includes money. Look at it this way ... if you had won the lottery or got an inheritance, would you expect to give any to him? Wouldnt you be a bit miffed about that?
ok, so its a ****** but tough luck! it was your choice to leave him, so i presume you wanted to not be tied to him in any way