Don't worry about the loans, these are also counted as marital debts so will be split 50/50
UNTRUE. I do wish people wouldn't say this, it is simply not true.
I was a Bank Manager for 27 years, and specialised in Debt Recovery for over a decade. My role was to pursue debtors for payment, and take legal action if necessary (if indeed there were any Post judgment remedies available).
Categorically, in the UK, if the debt is in the Op's name only, then the Lender cannot pursue her husband for any of it, unless he was a Guarantor or offered up some kind of security to back her loan.
She might be able to hammer out a separation agreement, that takes all assets and all loans into effect, as if they were joint, if her husband is feeling very "fair", BUT, if he decides to not help at all with the loans that are in her name, then she will have to pay them herself. If she cannot afford to, then the Lender will eventually pursue her for payment.
If the loans are unsecured, they will look at the amount outstanding to determine whether it's worth the expense of taking her to court to levy an asset for repayment (such as a car).
If the loans are secured, then of course they can go after whatever property was placed up as security.
Marital debt is not a "thing" in the UK.
My hope would be that Op's husband won't think too much about whose name everything is in, because he knows that really they spent all the money jointly, and in that sense everything will just get lumped together, but if his solicitor points out that the loans are in Ops name, and that he can walk away from them, then maybe he will?
Anyway, on another note, I'd be tempted to let him stay in the house now and again, and I'd message the OW to tell her exactly where he was. Let that sink in.
Op - important - does he have a good pension? Better than yours? You are entitled to half of it, and you can take this in cash. Never under estimate the importance of getting a very good Sol.