Just a few of questions.
Was Barry a Director or had any legal association with Hempel Aviation other than the same name?
Was the aircraft owned by Hempel Aviation?
Was the aircraft on Hempel Aviation AOC and operated under the supervision of the CP?
Was the aircraft operated under the Warbirds Association?
I think you will find the answer to all the above is "no"
I also think you will find that the A/C and surveillance (if there is such an animal) over its operation will fall between the crack between CASA and the Warbirds Association.
Nothing much of benefit will eventuate from this exercise.