Making a Will is probably even more important if you are an unmarried couple (or a same sex couple who have not entered into a civil partnership). There is no such legal status as “common law” husband or wife, and there are no provisions for unmarried couples under the current intestacy rules. Therefore your partner will not automatically inherit your Estate in the event of your death. Making a valid Will is the only way to ensure that the people you choose to leave assets to will be provided for in the event of your death.
This can have devastating financial and legal implications for the surviving partner, as well as major emotional stresses at the saddest of times.