My 16 y DD is having perm retainers fixed next friday which will cost £300. XP gives me £850 from CSA/month (for 2 DDs) but I feel that I should ask him for half the retainer's cost. I have been struggling with him to get the CSA payment, we used to have a private arrangement which he fobbed me off for many years. FYI the guy earns £6000/month after tax. Also my current DH has been of work for nearly 2 months as a contractor, so money is a bit tight this month. so IABU?