So, your flight leaves at about 4pm on a Sunday in the summer hols. Heathrow is about 2 1/2 hrs on a good run. Would you drive down and park (pre-arranged of course) on the Sunday morning - hoping there are no hold ups on the roads, or would you have a Heathrow hotel the night before. No worries on the road front but would have to kill quite a few hours before you could book your luggage in. Kids are teenagers..............Opinions please.