At BA mainline all pushbacks have the pin inserted as the tow crew will bring the required type. As part of the procedure the headset man will tell flight deck that he will clear to P 1 or P 2 side of the aircraft and hold up the pin and tape in his left hand to show it has been removed. Or to be more accurate this is what should happen? Watching pushbacks by various companies and at times including BA many of them are very slapdash and seem to have little or no procedures in place.