debt free wannabe (huge financial family mess)

RAS

Also check Refuge, Woman's Aid, Ann Craft who can provide advice and sign-post you to other services.

I'm really sorry that he's been targeting family and friends. I'd suggest that you at least share those links and accept that they may or may not want to take action against him. But further reports to the police of borrowing without means to pay may trigger action there.

Credit scores are irrelevant. What matters are financial records and having any financial link to someone who is engaged in financial abuse could affect you. The mortgage is understandable but you can't afford any other link.

Start by getting the divorce and then look at the financial settlement.