Pssst! These are the secret codes used at Gatwick Airport and on the London Underground (just don't tell anyone)

Ever heard a message at an airport, at a station or just around and about and wondered what on Earth it was about? We're lifting the lid on a few of them 

from getsurrey - News http://www.getsurrey.co.uk/lifestyle/fun-stuff/pssst-secret-codes-used-gatwick-12167230