Totally agree with Bishalisha work out how much local childcare is (nursery quotes on another thread were £42- £55 per day as an average, London was £95
PER DAY.
Present that to him along with what you would be earning if you returned to work. Both full time and part time hours.
Tell him he would have to change his hours to accommodate half the drop offs and pick ups, you being a team and all that.
Also tell him that housework would return back to 50/50 if you returned full time. Let's see if he is as keen to dictate what you spend then like he's your father or something.
I have been a SAHM for over a decade with two children now in secondary school. I have a credit card in DH's name that earns us points. I never have to justify anything I spend, never have. If I want a coffee I get one, just like he would do exactly the same. I bet your Dh spends money on stuff that you just don't know about.
At one time or another I have floated the idea of working but I really don't want to and Dh worships the ground I walk on because in truth, no-one wants to come home from working to do laundry, cook a meal, shop for food. I do all that.
Dh totally gets it. His own Mum was a SAHM and he really appreciated her. He loves coming home and spending time with the children because he doesn't have to do housework. Dinner is made, often with the DCs contributing to the cooking.
As the boys are older, we often go out for a late evening coffee, just the two of us.
Your OH is a dick, water? Fucking water? Sweet Jesus.