To apply for a UK ETA, first check whether your nationality requires this travel permission. You will generally need the passport you intend to use for your UK journey, personal information and a suitable photograph. Complete the online application carefully and make sure the details match your passport exactly. Pay the applicable application fee and submit the request for consideration. Once a decision is received, check the information carefully and travel with the same passport used in the application. If you change your passport after receiving an ETA, check whether you need to obtain a new one before travelling.