Not quite Shackman. There was a Gazelle crash at Chetwynd in about '79 or '80 - mutual CFS students - doing spot turns!
It was the "excessive rate of rotation around a point in front of the aircraft leading to excessive nose-down attitude" demo - which got TOO much nose down and crashed. Only Gaz and reputations damaged. Don't think that demo is done any more!
An amusing 'dit' on that one. Staish (C****y H******s) was on leave but staying in The Big House. Gave CFI (T*d B******s) strict instructions he was not to be disturbed for anything. First Staish hears is when his son - on IOT at Cranwell - 'phones home saying he's seen it on the news.
CFI: "Well, you did say don't disturb you for anything .........."
.... and the RAF half of the mutual crew (of course) got promoted and finished up working in the Palace .........