Fill out a passport application form. You can fill out the form online, obtain one from the local post office (UK only) or request that a form be mailed to you either via the telephone or the Internet. Call the passport advice hotline at 0300-222-0000 or click on the "Request a Passport Application" link in the Resources section to request your form.
Have your completed passport application counter-signed by someone who has known you for at least 10 years, holds a valid Irish or English passport and is willing to write her passport number on the form. (Note that this only applies if you are getting a new passport for the first time or are replacing a lost passport.)
Obtain a regulation passport photo. It must be 45 mm high by 35 mm wide and should be taken against a clean background. You cannot have any objects in the photo or anything obstructing your face, and you should make a neutral facial expression with your mouth closed. Have your counter-signatory from Step 2 sign and write “I certify that this is a true likeness of [Your Name]” on the back of each passport photo.
Provide proof of your identity. If you live in the UK (or were born in the UK and live abroad), you can use your national ID card and birth certificate. If you live in a British overseas territory you can use your current passport and birth certificate.
Bring all of the required materials, along with the relevant application fee (see Resources), to your local post office to make use of the “Check and Send” program if you live in the UK. If you live outside of the UK, you will have to mail all the materials in yourself.