spectre150
Perhaps the incident you refer to was at Finningly in 1964 I think when XH556 folded up on start up. Ground crew from underneath existed swiftly towards the hangar whilst the liney's ran in the opposite direction!
Indeed someone from the back row was seen exiting from the canopy area having, allegedly leaving his boot imprint on the co-pilots bone dome.
Fold up caused by short circuit in a terminal block in the fwd landing gearbay (ah! the Avro wiring system) casing the gear to retract on receipt of hydraulic pressure.
Cockpit fuselage was salvaged and last seen at a recent Farnborough airshow.