Additional £6000 added to mortgage.

Hello all,
I honestly thought when I won on 23rd March 2012 that I would not use this forum again and my new life would start but another battle is looming.
Settlement

I stay in marital home for at least 2 years.
He stays on mortgage for 2 years & I go back on it also.
He pays me £12,300 over two years.
If I haven''t increased salary to meet mortgage to release him from mortgage by month 21, flat goes on the market but I get any profit.
He wrecked the property with inept DIY skills & this deal allowed me time to get it renovated and increase value.

He swore on form E that mortgage was
£85,371.01 & produced a mortgage statement confirming but when forms finally came through, mortgage is £91,749. He messed around during the process changing to interest only but new paperwork is showing its back to capital & interest so suspect he''s run up charges through swapping mortgages but where do I go from here? I can afford to take a £6000 hit and surely, I have recourse. Lets hope so eh?
We are now divorced so can I get him back to court?
Any advice thoroughly appreciated.

Obvious question is what was out standing on the day he swore the Form E? What he swore may have been true at the time. I don''t know if there was anything in place saying he couldn''t change mortgage terms but if as you say you can afford to take a £6k hit is it worth following up? It could well cost you more than £6k

I doubt it''ll cost me much. I won my deal on a short marriage and made the journey with advice from here but ultimately from my own hard graft. Worked my butt off as a single Mum to buy this property, long before I met him. I fight on! Thank you for your response, though!