When I was a Hawk tech instructor in 4FTS Ground School ('83-85), the DCGI (Flt Lt Tony D-----) related an incident to me of his early days on the Gnat as a QFI. I can't remember the precise details, but he ended up at night circling overhead the Menai Straits with the stick planted hard in the dashboard, due to some bizarre configuration he had got himself into with his pitch controls. An emotional radio chat with the Duty Instructor in Valley ATC resolved the issue, fortunately.
Any opinions on the likely cause?
Are you out there, Tony D?
HB