British passport photographs need to meet certain standards to make sure that your physical identity is clearly and accurately represented in your passport.
Full information:
Passport photos
24-hour Passport Adviceline: 0300 222 0000 (see terms and conditions). Calls made to 0300 numbers from landlines and mobile phones are charged to customers at their network provider's national rate. Live operators are available to assist with your enquiry 24 hours a day.