Could it me that this chap misidentified the airfield on his FIRST approach?
ie during the approach, comes out of cloud, sees Ballykelly, thinks its Eglinton but he's too high of course to land, so goes round, repositions himself 'correctly' for the airfield he just saw and lands?
Just thinking out loud so to speak. After all it wouldn't be a tight circuit round Eglinton if it included, say a four mile final for Ballykelly would it?