Hi @lifeisntperfect.
I've actually just created an account so I could respond to those because I'm so incensed at your attitude.
I'm a single mum. I do not claim, nor did I ever claim child maintenance because of the reasons you are putting out for all of us. You've said you think its because I'm a woman (so.. somehow weaker?), you've said iit's because he owes it for leaving me (so my emotions/hurt can be bought and paid for?), you've said it's because of going through pregnancy and childbirth (so my uterus is up for sale?).
None of those are reasons for child maintenance. None.
Child maintenance is not split into man or woman. It is split into resident parent and non-resident parent because sometimes children stay with their fathers and not their mothers.
The maintenance is to support the children. It's not for your emotions, your hurt, your sex or pregnancy pain.
In my case, I pay for everything. All clubs, childcare etc. They see their dad once a week because that's all he wants so he doesnt need to prove anything other than 1 meal a week. He doeant contribute towards on costs directly I pay it all. So I claim child maintenance from him because that is what the government have mandated as his fair share.
Some resident parents are in a situation more similar to yours. The non-resident parent sees the kids half the week or at least every weekend of something. So they take on a decent amount of the parenting. But the resident parent is still the one paying for everything: the clubs, the childcare, they send a bag of clothes over etc. The resident parent shoulders most of the cost, so child maintenance is paid to them in order to help with those costs.
That is what it is for. The CMS assume that, even with shared care, it is the resident parent who pays for most of the stuff.
You and your ex are planning a completely 50/50 life. You earn the same, you're going to split everything 50/50. Why do you think you need more?
If you both really will split the cost of the kids 50/50, then neither of you are worse off and neither of you are suffering the financial burden. It is fair. You both have even time with them and will both want to take them to fun things or holidays etc. If you start taking another £300 from him a month, that's his "fun budget" gone. He will he paying half of everything you pay, as well as providing a home for them (just like you) and then he cant afford to do anything fun with them because you've decide you're owed money because you're a poor little woman who is upset she has been left. It's just not fair.
CMS assume that you are paying for everything so they mandate he pay you. You could claim it. But you know it's wrong because you actually arent paying for everything. In your situation, use your common sense and morality instead of grabbing for whatever you can get.