Why would the CAA be interested?
How about the ANO:
Articles; 4, 16/21, 50, 72/73, 137/138 from a quick look.
It could just as easily have ended in serious injury, or even a fatality.
A lawyer could make it difficult for the CAA to bring charges. He would argue that it was not an aircraft, because it was not registered as such and could not fly. How would article 50, for example, apply to this case?
Would the CAA intervene if someone was towed behind a car on rollerskates holding a kite and left the ground for a few seconds? Surely they should concentrate on more important issues instead of trying to slow up evolution by natural selection?