Hi my DH pays the CMS amount to his ex for the DSC, he is of the understanding that this is it. That's all he has to pay. Anything else extra is on top, so he pays for half their music lessons and the school trips. I'm asking because his ex has asked him for half the school uniform money for the last few years. He paid half when the eldest went up to secondary school but he said at the time this was a one off and he couldn't do it every year. Anyway he's received a stream of angry messages about it this year and a demand for money. Is he right? The CMS is it and uniform costs are factored into their calculation? Is there anywhere that tells you officially how they've worked it out?