Banks seem to have different methods so best speak to your bank and explain the situation. It may require two signatures to take your name off. You could threaten to have the account frozen if she doesn''t agree. I imagine if the bank are made aware that there is a dispute with the account then they''ll freeze it in any case, to protect their own interest.
I doubt the bank will remove your name, you need to get the account frozen. The Consent Order should have included an undertaking by both parties not to use the joint account.
The banks allowed the overdraft on the basis that the account was in both your names and so they (the bank )will hold you both jointly and severally liable for the overdraft.
If the banks pursue you for the overdraft not paying it will affect your credit rating, you will need to take legal action yourself against your ex for not fulfilling her part of the Consent Order.
I am not a solicitor the above reflects my understanding and isn''t legal advice.