Blagger (but anybody else flying Vigilants and Tutors...) You can't just turn 180 degrees - either you're going to:
(1) turn 45 left, turn 225 right,
(2) turn 225 right, turn 45 left
A turnback has always got to involve roughly 270 degrees of heading change.
Unless, I suppose, you can take advantage of a howling crosswind.
What you've described really seem to be outfield landings, somewhere on the airfield - rather than back onto the runway which is surely what a turnback is about. A turn onto a downwind leg is a glide circuit, not a turnback.
In my opinon
G