I'm not sure why this has dissolved into a discussion about what OP should've done, she is where she is, which is vulnerable, and in her own words, a bit clueless.
I'm pretty sure, from reading her posts, that her ex is trying to manage her expectations down. As said above, if they really only have the pensions and house, how is he travelling so much much. Unless he's listing it all as work?
OP, I'm curious, why are you in a house that "only" costs 800k if he has millions in a pension and you've both been enjoying an incredibly wealthy lifestyle? How is it that half a family home won't pay for a 1 bedroom flat? That calculation is normally very different. Eg I've looked at Bromley, which isn't London, but you can get a lovely 5 bed family home for 800-850, which is the number you mention. A very central 1 bedder in the same area, new build or Victorian conversion can be around 200-250k.
He's lucky you didn't leave 10 years ago because you would've come away with more, given that he still had the capacity to earn a large salary, and you never would. I'm guessing this close to retirement it will be more 50:50.
That solicitor appt can't come a moment too soon. Every woman I know who has been through a wealthy divorce in their 50s has had to deal with the ex being... economical with the truth. Some weren't surprised because their husbands were aholes, but even the one who was in an amicable split discovered that he had a stash of $80k he didn't think needed mentioning.
I'm not saying you need to be claws-out, but please open your eyes. You might have another 30-40 years ahead of you and you need to do everything you can to get as much as you can, to see yourself through. Going to work is still a very good idea, but that's separate and you shouldn't do that until everything is settled.
You went into this marriage in good faith, did things the way you both wanted, that he suggested, and he's the one who's changed the goal posts.l. That's entirely reasonable, bit what isn't fair is to keep moving the goal posts without talking to you about it. You have ended up with relatively little in your name, and you need to advocate for your future self.
Look through the relationships threads and find examples of how you get your ducks in a row at separation. You need copies of bank statements, pensions, portfolios, any outstanding liens, loans or mortgages. This way your solicitor is playing with all the information. If exDH has stuffed every last cent into his pension instead of having any other assets, it should be relatively easy to sort out.
I do understand the people saying why didn't you work, but within the context of your lives, it all seemed entirely normal. If he never once seemed concerned, irritated, annoyed at your staying home, if he never once suggested you could go back to education, or start working, then implicit in that is that you were a team, and that you were both happy with the status quo. Therefore, you both own everything.