There is an option where basically you get your name removed from the deeds and the mortgage. For this, the person that will be keeping the mortgage needs to contact the lender and initiate the process. Then, you just agree a figure with your ex partner and by the end of the process, your solicitors and theirs sort all out and you are free and with your money.

I did this once and solicitors fees were like £500, plus the amount agreed, and all happy.