Finished instructing at IOT in early 85 on promotion but the 'grapevine mafia' was still working and managed to see a still photo of the said flypast. The pic was taken from the east wing of CHOM (nearest the church) from one of the top floor windows. It clearly showed the 'tooms fin below the level of the top floor windows on the west wing (nearest Whittle Hall)! Bloody impressive but I think that the pic formed part of the BOI! The pic might have been part of a video taken. Seemed a LOT lower than 72'.
At my current location it became a bit of thing to do an airfield beat up on return to base. All was fine and dandy until I took a pic of our chief engineer/pilot doing one. And by the simple process of measuring the wing against the height above the shadow on the ground I made it ELEVEN FEET. Sanity ruled after that! OK it was only a Cessna 182 RG but they still make good smoking holes in the ground particulary at 100+ kts!