@MessAllOver
The issue isn't moving on per se. It's moving on and ignoring your responsibilities to your existing children.
Thing is he isn’t is he. He paid, his £250 until he couldn’t. He and his wife may or may not have planned a baby, but they didn’t plan 2, that’s just life. So they have to adjust.
With any children there is no reason ever for both parents not to be working, one parent should. With his youngest DC he is now the SAHP and wife continues to work; because that makes sense. Previously Op was the SAHP and he worked because for them THAT made financial sense to do. Now he has 4 children to consider. He can be SAHP to all 4, no reason why he can’t. So OP could now work too.
I don’t agree with the consensus that when you have chosen to be a SAHP you are entitled to do so regardless. When this was chosen, she could afford it, now she can’t, things have changed. So other things have to change too.
What is UC changed and cut by £250, would we be saying the state needs to find the money and fund that extra 250 regardless of if that means that we have to pay for healthcare now; or council tax goes up again to cover it. No, we’d be saying, things have changed, so you are going to have to work to find that extra.
It’s life, if you aren’t entitled to it, you can’t forcibly have it. If you can change your own circumstances but are choosing not to and looking at someone else to do it, then I don’t have sympathy for that. If you can rightfully say you are doing all you can, and then someone screws you over; then that I can get on board with.