ePassport gates are automated self-service barriers operated by the UK Border Force and located at immigration checkpoints in arrival halls in some airports across the United Kingdom, offering an alternative to using desks staffed by immigration officers. The gates use facial recognition technology to verify the user's identity against the data stored in the chip in their biometric passport.
EPassport gates Wikipedia
At present, British citizens, European Economic Area citizens and citizens of Australia, Canada, Hong Kong, Japan, New Zealand, Singapore, South Korea, Taiwan and the United States who are enrolled in the Registered Traveller Service, can use ePassport gates, provided that they are aged either 18 and over or 12 and over travelling with an adult and holding valid biometric passports.
At present, European Economic Area and Swiss citizens cannot use national identity cards (regardless of whether they are biometric) at ePassport gates and have to use the staffed desks instead.
At present, ePassport gates are available at the following locations:Birmingham Airport
East Midlands Airport
Eurostar St Pancras Terminal
Gatwick Airport (North and South Terminals)
Heathrow Airport (Terminals 2, 3, 4 and 5)†
London City Airport
Los Angeles International Airport
Manchester Airport (Terminals 1, 2 and 3)
† Heathrow Airport Terminal 1 became obsolete on 29 June 2015.