@DivorcingDebbie25 I think you need to take a bit of time, and remember why you wanted to divorce. You are both going to be less wealthy when this has all gone through.
You need a family lawyer, presume you have some access to funds.
You H doesn’t sound unreasonable, paying rent for you and agreeing to separate on your request. He sounds like he is fine to go along with things that I assume he thinks you want.
But you can’t have it all.
Once divorced his future earnings will be his and any inheritance which might come his way will also be his (inheritance can be expected but until it happens isn’t guaranteed).
Have you looked at your own state pension? How many years credits you have (you will have some from child benefit) but you need to look at that and also look at what benefits you might be able to claim, they will give you credits towards state pension but job seekers for example will expect to see evidence of you looking for work.
If he had a pension pot of “millions” you will get some, £1 million pension pot can give you £30-40k income for about 30 years - that takes you to 90.
Which will mean a lower lifestyle I expect for you but you won’t starve, you need to look at what income you will have in relation to what property you could afford to run. But this all isn’t bad for someone who has never earned.
You will need this income for the future so asking for the cash value seems dumb, plus legally you can’t just withdraw money from pension funds, you can take some out, but that reduces future payments and you will need income (especially if you have little state pension) you need to leave as much as you can in the fund.
So you need to take some time and take this one step at a time.
Hopefully you both can divorce amicably and you can move forward remaining parents/grandparents to your family.
There are many strands with divorce, it sounds like there are enough assets for you to be ok. But the emotional and family dynamics are all things to considered and it would help if you were gracious during the separation process. And remember this was your choice.
Are you going to have a fabulous house, in a nice area of London, with endless funds to travel and dine out? Unlikely (depends on the pension pot and what millions means).
But you could easily have a smaller home and secure average income. No one in real life gets richer in divorce.