Hi We have 2 child ogether and just recently sepearted one child is at school and one child is at childminders full time, when i pay the maintenance based on my salary and what i earn which is £49 a week, Do I still need to pay for half of the childcare fees on top of the maintenance money
Legally you are only obligated to pay for maintenance.
However, many non-resident parents also pay half of ongoing costs like school trips and school uniform etc.
Technically you are only obligated to pay for childcare that you use for your contact time, though obviously this will leave their mother at a huge financial disadvantage and your children by default. However, if your ex is claiming 85% of the childcare costs via Universal credit you could suggest that you pay 7.5% of the childcare costs per month.