UK electronic travel authorisation

The United Kingdom Electronic Travel Authorisation (ETA) is a planned Home Office electronic system that will be used to pre-check migrants travelling to the UK.
The system will operate using an online application which is checked against a variety of security databases, and if the person has not committed a crime they will be given travel authorisation. If the person has committed a crime, their application will go for further review to decide whether or not to allow them travel authorisation.