Plus there are signs all over both terminals saying which flights go from which terminal (i.e. all domestic from South Terminal along with all flight numbers beginning with a 5 - North Terminal all flights beginning with an 8).
PLUS your booking itinerary would have clearly said which terminal to go from.
And signs on the M23 exits and along the local roads saying "Check your terminal, easyJet flights change from 30th March" or something like that
