Thanks everyone for their comments. Gosh, there’s rather a lot of them aren’t there and not had time to read them all in detail but I thank you for taking the time to reply, I’ll just pick out a few if I may but….
Firstly, I’ve not used the words controlling or coercive control. I made a point of not writing that in my OP as I don’t think it’s true I did say when I looked it into it and talked to other women who might have used those words to describe their marriages I did think to my DH has some of the same traits as @silverbrooks said there are a lot of men like my husband in the City (and on wall Street and in Frankfurt!) I know I’ve met them! And, yes, he is a bit arrogant as some else said. I think of him as being very traditional, conservative and old fashioned rathe than anything else and I know he’d be shocked if he knew I’d posted this as he considered the marriage to be very strong. Of course, I could divorce him! I have considered the D word at various times over the years but I guess, yes, the lifestyle was and probably is a big attraction but also the children and the grandchildren and the fact things a generally OK - I agree with @sparklefizz comment in regard to divorce - have thought the same.
Secondly, yes, I agree I’ve had a very comfortable lifestyle and owe it all to my husband and that’s why I respect him. I am by nature quite a placid person but that doesn’t mean we’ve not had rows over the years (some pretty big ones), of course we have, but life is easier if we don’t disagree, I hated it when the children were young and they were upset. Do I need to stand up for myself more? Of course I do but its hard when you haven’t done it that often as @Eazybee said.
Frankly, I don't think you have a bad life now, and if 'not looking a mess' and not disagreeing with your husband's opinion is the price you pay, there are worse things.
True!
@Notspaghetti wrote a nice post and I do agree with a lot of @M0nica has said too, it is about adjustments which are long time coming in DH’s case as he’s been retired a while but he’s definitely better than he was when he first retired (Covid was an absolute nightmare!!) but @silverbrooks has hit the nail on the head though I wouldn't have put it like this myself, 
^essentially about the adjustments all couples have to make
It could be partly but I think it’s more than that.
Her job hasn’t changed. The eldest is 24 and should be capable of shifting for himself. OP says she had domestic help with the children and the home anyway. She’s been floating around enjoying all the trappings of a wealthy lifestyle for 35 years, playing the trophy wife and mother.
Only now is she admitting that hedonism comes at a price. That price is it be shackled to what was once an entitled public schoolboy, who grew up to be an entitled City moneymaker who has now turned into an old man who can no longer play top dog in EC2. Believe me, I worked in the City for decades and know the type. They are ten-a-penny bullies and bores.
So what if a man finds retirement hard? That is not an excuse to throw his weight around at home.^
Its that last bit I’m struggling with!
And yes it probably does mean me changing because he certainly won't. It has been helpful this so I think you all. I probably was a bit vague when I wrote this this morning but I can see more clearly now what the issues are also that perhaps I'm making a mountain out of a mole hill.