me again !
I just found this on the net by using your phrase volutary financial arangements.
It seems to be a usa based doc and while i appreciate usa law is not always the same as english law i dont see why the law here seems to view a "vol fin arrangement! as something other than "a contract"
A separation agreement is an agreement between a husband and wife when they separate from each other.
Once signed, it becomes a binding contract between them.
It contains binding and – in most cases – final promises.
A separation agreement must be voluntary. No law or regulation requires a separating couple to execute a separation agreement.
No one can compel a spouse to sign a separation agreement.
"agreement" means that both parties sign voluntarily.
Coercion, fraud, undue influence, or lack of knowledge will void the
terms of a separation agreement.