The name on your passport should always match your legal name. So if your name changes you need to get your passport amended. This is true whether you change your name by deed poll or when you get married or form a civil partnership.
24-hour Passport Adviceline: 0870 521 0410 (see terms and conditions). Calls are charged at 8p per
minute from a BT landline; live operators are available to assist with your enquiry 24 hours a day