I think this may clear things up a little; regardless of class or culture! You have EITHER Lunch and then Dinner or you have Dinner and then Tea, ergo, Dinner is the main meal of the day regardless of whether you eat it around 12'ish or 6'ish. My Dad, Yorkshire of Irish descent, liked to have Dinner in the evening, but my Mother, who was born in India, prefered mid-day, then to rest in the heat of the afternoon: as I speak it is raining cats and dogs in August...