Have you made a will? If not who will get your money, property and possessions? Not necessarily your wife, husband or civil partner. And if you're living with someone, not your partner at all.
Though the law is different in Scotland. New proposals from the Law Commission (England and Wales) would change the rules for married couples and civil partners and give unmarried couples similar rights to spouses.
Money Box talked to Professor Elizabeth Cooke, the Law Commissioner leading the project.
This item was first broadcast on Radio 4's Money Box on Saturday, 31 October 2009.