I just shuddered when I read of pilots being taught to descend to circuit height whilst on the downwind leg. What about aircraft already there doing circuits? My aircraft doesn't have a glass floor (perhaps it should have). Downwind descents are probably ok for preachers in motorised parachutes, (reference to some strange happenings at O.S. a little while ago), but not good practice for aircraft, surely...??? Do people really do this???