GOLF_BRAVO_ZULU stated:-
"Fascinating. Were many landings made at Shoeburyness?"
Frank Barnett-Jones wrote "
There was evidence to show that the system was vulnerable when the ankle on XR219 sheared without warning during trial at Shoeburyness"
I think you will find what he meant was that the evidence of this failure could be seen at Shoeburyness as XR219, XR221 and XR223 were taken to the shooting range at Shoeburyness to be destroyed as 'damage to aircraft' targets.
The following is a photograph showing the sad end for XR219, shot to pieces at Shoeburyness.
