My UK experience is that for many people it is dinner, not lunch, that is the main meal of the day. You might have a sandwich or something similar that you can

My UK experience is that for many people it is dinner, not lunch, that is the main meal of the day. You might have a sandwich or something similar that you can eat in the break room at work, and then go home for a cooked meal with the rest of your family in the evening. This isn't universal, of course -- I have my main meal at lunch because I can get a cooked meal in the work cafeteria and then I don't need to cook for myself at home. But in the past when I've worked places that don't have cafeterias I've eaten sandwiches and had the main meal in the evening.