Likewise there is a JP3 display pilot in the UK, with 500 hrs on jets, who also claims to have displayed the Hunter T7, again on a PPL, medical unknown. I'm not sure if this was the pilot involved in the Southport/Blackpool JP near accident?
You refer to Neil McCarthy, obviously. Probably a class 2 medical one would assume. Then again, you know what they say about assumptions... I don't believe it was him that was involved in the Blackpool incident. As far as I know, he only ever positioned the Hunter to displays and Chris or Andy did the poling in the shows.
I don't see an issue with PPl's or class 2 medical holders displaying aircraft. I was happy enough to watch Bob Hoover display on an FAA class 3 medical. There are numerous extremely competent DA holders that 'only' have a Private Pilot's Licence. There are numerous ATPL's displaying aircraft with less time in the seat doing aero's than the PPL pilots.
This aircraft was a stablemate of the Gnat at North Weald sadly.
http://www.caa.co.uk/docs/33/SD2015003.pdf