Positive!
I finished my Valiant conversion in June 1962 and was posted to 90 Sqn at Honington which had just converted to the flight refuelling role. I was immediately sent on the flight refuelling course at Marham where I learned all about the extra tanks, HDUs, refuelling baskets and probes. As far as the staff were concerned the VC10 tanker was just around the corner and was certain to replace the Valiant in the Tanker role.
How official were those thoughts at the time i don't know but they had gone to great lengths to manufacture full classroom size boards with the fuel systems illustrated.