If you need to change your name, maybe because you've just got married, you'll need a deed poll certifivate to show banks, passport office and others.
There are a lot of sites out there that will charge you a fee up to £50 for something that can be done for free. The most important thing being the wording and getting the form signed by a witness. It really shouldn't cost you anything.
- Fill in the form and you'll get a free certificate for you to print out.