I am not really a spotter as in the 'train spotting' tag, however I live with a view of the approach path to 25 at BFS and the westerly at BHD. BHD is quite far away, however aircraft can be easily identified through binoculars. So when a Belfast bound aircraft comes in from the north (normally the transatlantic traffic) it would fly right over the house and that sentry was loud. So it prompted a look out the window. But thanks for that it probably was that aircraft.