There are half-a-dozen eateries before Security and about twice that number after Security. Choose from burgers, pizzas, sandwiches, Italian and Asian dishes, as well as a number of places to grab a coffee. The Great British Sausage Company is open 24 hours and there are also a couple of bars if you wish to enjoy a pre-flight drink.
If you're lost or need some help, look out for the Passenger Service Assistants who you'll see all around the airport.
Their high-visibility uniform carries the 'i' information symbol, so they are easy to spot.