I flew from Heathrow to Dallas and back on a BA A380. I flew business class and the seating really sucks. The problems are that to get to the window seats you have to squeeze through two other seats and that you have to go through the space of the aisle seat. The latter isn't really a problem during the day when passengers are sat upright but is during a night flight when the passenger with the window seat needs to get up to visit the toilet because the aisle passenger needs to wake and move their legs out of the way.