Don't really understand the topic. I boarded BA155 yesterday travelling in CW and I did notice that the BP had Group 2 on it. I had zero idea what this meant, but in due course found myself at gate A10, for the usual refugee transport across the tarmac to a plane parked somewhere in the stygian gloom of Heathrow in winter. I did note that what seemed like 50% of the assembled refugees were in the so-called "priority" boarding line and there as quite a bit of jostling to get onto the bus. But to be honest, the whole procedure seemed just as unpleasant as I remembered it from a couple of years ago (the last time I conferred my business on BA) - and Group Boarding, had I even been aware of it, seemed an utter irrelevance.