I worked for a small regional airline in the north back in the day, and one of the engineers that worked there was employed at the A.V. Roe plant where the Arrow was being developed. He said when the project was cancelled it was like something out of a black-bag spy movie. A sizable crew showed up unannounced, sent the staff home and proceeded to box and crate everything. The six prototypes were taken apart with cutting torches, every scrap of paper was boxed, and the whole thing was nothing but a memory within days. The Arrow was the most advanced aircraft of its type in existence at the time, and many of its design innovations are still in use today.