When my ex and I divorced he agreed to let me continue receiving the child benefit for our children. He earns 60k per year whereas I earn £20k. Initially we agreed to pay 50/50 towards the children's essentials- school uniform, shoes, coats, school trips etc but now he refuses to pay half stating that I should buy these things with the child benefit. I do use the c/b to buy these items but also use it towards food, gas/elec/water bills, rent, petrol etc. I'm just really struggling financially footing the bill for all these things. He doesn't pay anything else towards the children.
Is it correct that I should solely buy all these essential items for our children with being in receipt of the child benefit?