"The only scant info I can find about the Canberra it was used by Huntings"
I'll ask around as I haven't got a clue.
One (very) wild guess might be a connection to Hunting weapons testing.....
P.S. I remember Barry Radley climbing out of that Provost after an aeros display and the old man introducing me to him :
"Bloody rough up there today!" he said.
Such things stick in the mind of a small boy......