Heathrow and maybe other UK airports, but not all, whether you're entering or exiting, will take (two) photos, AIUI, in order to verify the correct person is bo

Heathrow and maybe other UK airports, but not all, whether you're entering or exiting, will take (two) photos, AIUI, in order to verify the correct person is boarding the aircraft. Don't worry, they only keep your data for "as long as is necessary". http://www.heathrow.com/departures/security-and-baggage/flying-within-the-uk-and-ireland http://www.heathrow.com/departures/security-and-baggage/flyi...