Miles apart on financial settlement

Both 48
Married 10+yrs
Shared custody of children
Very good salaries with mine being slightly more

I'm 95% confident my ex is being entriely unreasonable. We in theory have the same housing needs and the same outgoings. But she seems convinced her outgoings are £1000 more than what they actually are. It's really basic maths but she seems incapable of even that atm.

I've offered 50/50 split of house/savings and split the difference in salaries as a one off payment which endus up as 45/55% of assets.

With her insane assessment of her outgoings she's asking for in effect 30/70%

I really don't see her coming to her senses given the above. But i really don't want us wasting £40k on legal fees and my solicitor has said the same.

I've spoken to freinds, my solicitor, another non-paid for solictor through my work benefits, and 95% know that my assemesent is entirely reasonable.

I want this over and done with without feeling done over. If we were arguing over £10k i wouldnt care less. But theres a £200k gulf between us. Has anyone been in the same situtaion and manged to get their respective halves to climb down from unrealistic expections before going to court? How far am i going to have to go to her £200k considering I seem to be dealing with someone who isn't behaving rationally?

Have you tried mediation?
It s a long journey between the initial negotiations and a final hearing where the court imposed an order as you can’t agree,

Yep. Tried. But again was just unable to get any common sense out of her.

Post some figures.