Sorry for my ignorance, or in case I have missed previous messages, but can I ask why maintenance at this level was set until the child was 18? Was there a massive income disparity? Did the mum ever return to full time work? Did it include a spousal maintenance element too?
My dad paid my mum child support until we turned 18. After that he paid towards our rent and living costs at uni, bought our books and sent us 50 quid a week supermarket vouchers for food. The only difference was he no longer gave money to our mum.
Mum never took the opportunity to retrain or skill up so she sold the family house, downsized, and lived I think on the remaining equity. But that was her choice. Once we were old enough she could have gone back to work. She had a degree.
In this day and age, I don't understand why women expect their former husbands to subsidise them beyond the day a child has moved out of home. I admit I don't know the legal ins and outs, but aren't these 'mesher' orders a thing of the past?
I am divorced myself. Clean break, 50-50 childcare split, worked full time from when my child was three months old. My exh did pay half for our nanny, who only I needed to use because he has a much more flexible job, when our child was young enough to need full time adult supervision. We will now share all university fees and living costs, as specified in our financial order.
If the OP's husband is going to fund university and house deposits and such, I don't understand why he needs to pay any more money to the mum? Unless there was an order for lifetime financial support?