For Court Approved tests, each test participant must provide two identical photos, which have been taken in the last month. Nothing should be written on the back.
Suitable photographs can be obtained from automatic photo booths located in some railway stations, post offices and shops.
To find the location of your nearest Photo-Me booth call 0800 035 6600.
You can also use your own camera or phone (at least 3 megapixels) and upload the image to framelizard who offer a guaranteed passport photo printing service.
For very young babies, it may be easier to ask a photo processing shop to take their passport approved picture.
See UK Passport Service for the strict rules about passport photographs.