T5 South Lounge C class - normally smoked salmon bagel + soup (no problem to ask for 2 bagels)
T5 F lounge - choice of meatballs+spaghetti, chinese chicken+rice, salmon+mashed potato or omelette (normally at least 3 of these are available). Personally I prefer the chicken, then salmon. but all good (apart from omelette).. Also salted Kettles chips are kosher (they have KLBD hechsher)
T5 North lounge - last time I was there I got a delicious salt beef sandwich (or two..)
T3 - I have had meals there in the past, normally they have stock.