Any guesses on the identity and type of that tail sporting an ensign on the tail in the background?
EvansB:
I'm quite certain that's a DHC-4A Caribou tailfin sticking up above the Comet. I'm also fairly certain it was CF-OYE, S/N 40, DHC's demomstrator for some years. As the flag is the Canadian Ensign, pre-Maple Leaf flag, which was launched on February 15th, 1965, it obviously pre-dates that visit.
I would guess the photo was taken at Hatfield (if the Houchin GPU was any indication) where the Comet might have been on pre-delivery prep.
The Caribou probably stopped in at the parent DH company enroute from/to the 1964 world tour??
TC