Interesting observation and question.Did your development work with the Canard foil (front wing?) lead to the knowledge of how to create the AVS?
I think remember it being said the surface of the spitfire wings was mportant, and maybe different from some others.
Perhaps they were experimenting based in theory, or maybe they tested a part that came out with ridges accidentally from a CNC malfunction or error and found it had a benefit...
Whatever the cause this is a fascinating development that could be helpful, I hope, for many kinds of foils!