When selecting the gender field on a UK ETA application, it is important to choose the same gender shown on your passport.
If the gender entered in the application does not match your passport information, it may cause delays in review or issues during information verification.
It may also require additional checks during airline check-in or UK entry procedures.
Therefore, before applying, you should check the gender field on your passport and enter the same information in the application.
UK ETA application information may be checked together with passport details, so it is recommended to use the official information shown on your travel document rather than personal expression or other identity information.