Allan, I remember another incident at the club circuit for the quickfire meeting that was run and televised around 1970.
A Triumph 2000 or 2500 broke a halfshaft coming past the stables on the right hand bend the halfshaft and wheel left the car and speared down the track. the errant part hit / was hit by a Mini in the front and looked like this afterwards [ no pic of the Triumph but here is the Mini ].
Hand drawn plan of the club circuit - from the NSCC Motorsport Day 1978 Regulations and Route Book.