ok thanks for the extra info.
I think that given that court proceedings are ongoing, the charge at the Land Registry is likely to be what used to be called a "pending land action" (sorry don't remember if the name has changed recently) ie there is a court case concerning the house, so the applicant is protecting their interest until the court case has been decided. I think therefore that the Land Registry will not remove the charge (unless your fiance's ex as the applicant wants them to) because it is not their job to decide disputes between couples, only to check if the grounds for the charge are correct, which they are.
However, if your fiance was prepared to agree that the net sale proceeds should be kept in an account in the name of his conveyancing solicitor until the court case was decided, that might reassure his ex and then if she agreed, she or her solciitor could apply to the Land Registry to have the charge removed - but note - it does depend on yoru fiance's ex AGREEING to have the charge removed - otherwise, he will need to wait until the court case has decided what should happen to the house or net sale proceeds, and then, when he sends a copy of teh final order to the Land Registry, when they see that the court case has ended, they will lift the charge.
It is important that your fiance cooperates fully with the court case - that means that he will have to prepare his financial statement in Form E - just as his ex will havae to. It's only when the court has full financial information from both of them that the court can decide what is the fairest outcome.
Here's the Form E that he needs to complete, and attach all the documents referred to in it:
The form then needs to be sent to court, and a copy sent to his ex's solicitor (and keep a copy himself).
I think your fiance woul also benefit from some face-to-face legal advice. Here's where to find a specialist family law solicitor:-
I hope this helps and I wish you the best of luck.
Thanks and best wishes...