Thanks for the previous posts. The lack of a flat bed was indeed a factor, esp for the return leg. And I do find that smiling at the crew usually makes life much easier!
Quick additional question : I have 3K and 4A booked for the outward and return. I note 11A/K are open on both flights - do these seats allow free access to the aisle (like e.g. 64A/K on the 744), and if so would you recommend these seats vs staying in the quieter forward cabin?