Von Braun. *shudder*von Braun's.
The man who aimed for the stars, but kept missing and hitting London. Surely there's someone more competent than that hack? Given the destitute state of the economy the post-war British rocket programme wasn't that bad.
Assuming your Britain keeps the big lead from jet engines there will be some of the best combustion design engineers and fluid mechanics experts in the world. If you don't give all that information away, stop the talent going with it and don't suffer Labour mismanagement I think 1965 is perhaps a tad conservative.