Don't know - that's what I was wondering as I've only ever heard Hemswell mentioned a few times but nothing "official" anywhere. I guess some sort of ground school might have been more likely although I would imagine the available runway would have been more than enough for the TSR2 as it was (must have been at least 6,000ft?). The OCU was certainly destined for Coningsby though, but I've never seen any indication as to what the number plate would have been.