From memory the C182 accident at Leicester was electric trim runaway, I'm not sure if that happened independantly of the autopilot. But it had been previously reported by another pilot.But in that case it would not have been instantanious, but also at the time I was told that under certification that the pilots should of had the strength to still control the aircraft. Sadly at the time neither pilot would have been trained for trim runaway, having trained on C152s.