I'm not sure if it was the one that rolled itself over between the hangars at Shawbury late 80s/early 90s?
Every Wessex pilot knew the risks of ground resonance in the old girl but more scary was doing full power pulls with the aircraft chained to the ground - you knew if any one of the chains let go, it was going to be brown underpants time.
Remember one of those trying to get one of the fuel computers to reproduce an intermittent fault. Scheduled for 2 hours, by an hour and a half I was losing the will to live, starting to need a wee and seriously considering sacking it off when it finally failed.
Got programmed for the same thing the next evening, I respectfully requested someone else might be considered for the task.