Here's the story. The RAF needed a trainer and fast. De Havilland proposed the Gipsy Moth, but it was rejected. One of the main reasons being that the position of the aircraft's top wing meant a pilot wearing a parachute couldn't bail out of the plane. So de Havilland hastily went back to the workshop (no time for going back to the drawing board) and made several changes, including pushing the wings forward, thus creating the Tiger version of the Moths. And the rest, as they say, is history! (Great pub quiz question too - you can thank us later for this golden nugget of Moth information!).