A couple of reasons why 1 A/K are so popular. Generally first to get served, but best of all you are positioned furthest away from the galley and the inherent crew noise that comes with being so close.
I wish crew training on BA included learning to talk quietly in the galley as well as how to close overhead bins Thai style, i.e. with the latch open and then release to lock rather than the typical BA crew method SLAM THEM BLOODY BIN SHUT!
I came back from last Sunday afternoon, crew had absolute no care for the business class passengers trying to sleep.