Providing that you have gone through a legally binding ceremony, your civil partner will have exactly the same rights as a spouse would.

Registration of the civil partnership (like marriage) invalidates any existing will, unless the will was drawn up in expectation of this registration. If you have not registered the civil partnership, and have not made a will, your partner will not be automatically entitled to anything. So, if you are planning to register a civil partnership, have registered a civil partnership without considering the impact on your will, or have not made a will anyway, take advice.