You can apply to the court for interim maintenance or maintenance pending suit if you were married or in a civil partnership. (familyblawg.com)
It is possible to apply to the court for your spouse to provide you with interim maintenance, also known as maintenance pending suit. (vardags.com)
If you're going through divorce or dissolution, you can agree short - term or interim maintenance payments from your husband, wife or civil partner. (moneyadviceservice.org.uk)