My ex partner has stopped replying both to the solicitors and to me and I would like some advice about what to do next. We were not married and at the moment he has regular fortnightly contact with our son and pays the bare minimum maintenance based on CSA calculations - though this is done on an agreement between ourselves as we would both lose out if the CSA were involved. I am trying to get a formal agreement with regard to contact time, school holidays, Christmas holidays etc but he has refused to reply to the last two solicitors letters and hasn't even replied to my email asking him to respond to them. I appreciate that he is more than likely doing this because he knows it will both wind me up and cost more money but I wondered if anybody has any good advice about what I can do next? I don't want to go down the mediation route because it isn't legally binding and I need something which is - hence going through the solicitors. Shall I just stop trying to get him to respond and instead instruct the solicitors to apply to the court or what? Any helpful hints greatly appreciated.