If your personal details change you must let the know. There are relevant sections to change your address, first name, last name and marital status.
You can also use this application if your personal details have changed. Your national insurance number in unique to you and cannot be changed, you cannot apply for a brand new one. Our service fee is £30.00, which includes the printing of your replacement documents and postage costs. This application is used to find your National Insurance Number.