I agree OP
I think in the recent survey, a third of parents said childcare costs were their biggest expense, more than their mortgage payment.
If you have a 1 year old and an almost 3 year old in nursery full time it's going to be £2k a month. Most parents can not magic up their ex partners share in a split. So they have to quit work. Its forcing children into poverty.
If the nrp was paying a share prior to the split there is no reason why they shouldn't continue to pay after the split.
Quite simply, although both partners in an ex couple are going to be worse off after a split, it shouldn't disproportionately affect the resident parents finances, and the resident parent shouldn't be better off financially than they were before the split. If they previously spent half their take home pay solely on their share of childcare, its mad that they then only have to contribute a smaller percentage towards the total cost of raising a child.
Its white complex but given how advanced technology is, someone should be able to come up with an algorithm of how many days a week each parent works, how many days a week the child goes to nursery, nursery costs, wages, and a fair split in childcare costs until the child is in school