https://www.key.aero/article/database-fairey-firefly
Maybe linked to this
"Over the next few years, the Firefly squadrons were kept busy with military exercises, display flights and training. Unfortunately, a number of crashes marred the type’s early service, though an investigation concluded there was no flaw with the aircraft. In fact, a Firefly on test was found to have strength factors somewhat greater than Fairey had claimed. As most of the mishaps took place during aerobatics, it was likely the manner in which the aircraft were flown contributed to the accidents.""