As I said before, 40 hours on a FJ like the Hunter is not enough to perform at any show. The derry turn in a JP at Southport looked very hairy indeed. The CAA has a lot to answer.
I don't agree that you need that many hours on type to safely display an aircraft. The Hunter crashed because the manoeuvre was continued despite below the pilot's gate height/speed.
The JP at Southend was also very poorly flow, but that manoeuvre was a Canadian Break - not a Derry Turn!