On the LGW 747's there's a small economy cabin (about 4 rows) just behind the premium cabin in front of doors 2. It remained nice and quiet, had first choice of the meals and plenty of room in the cross aisle at doors 2 to stretch your legs. And it's far enough away from the nearest loos (at doors 3) to avoid people marching up and down the aisle banging into you. (and as long as the jetty is at doors 2, you're one of the first off)