Preparing the necessary information before applying for a UK Electronic Travel Authorisation can make the process easier and more organized. Applicants should keep their valid travel passport, an accessible email address, and a credit or debit card ready for payment. The UK ETA required documents checklist also includes a recent digital photograph of the applicant's face and a photograph or scan of the passport, depending on the application method. Travelers should ensure that all personal and passport details are accurate before submission. Each family member, including children and infants, must have an individual ETA when required for their nationality.