Wow the CAA obviously do not know the cause! with such a specific flying ban on the Hunters it's more like they cannot fly until the aircraft gets a clean bill of health!
If no definitive cause is found does that mean the ban may not be lifted ?
I know when I was involved in air racing back in the early 2000s a rival competitor had to use a jet provost as his privately owned Hunter was not acceptable to the French in their airspace while the provost was acceptable
Pace