I still recall one "swept wing" lesson on the Gnat "Don't tighten the final turn". I did one day, having been blown in toward the runway by a stronger cross wind than I had allowed for. As we sank like a lift, me fresh out of ideas, a Rhodesian voice in the back said two things - "I have control" and after he had unloaded and rolled level - " If you had been on your own, you would be adjectival dead". Never forgot, and even now as I turn final in a glider, VW (with whom I am back in touch) is sitting on my shoulder whispering "Don't tighten the turn"