My ATC Squadron visited Weybridge sometime in the early 60's to be shown the VC10 production hangar. A few things stuck in my mind; the tail span was the same as the Scimitar main wing span, the milling of the skins for the wings was cutting edge technology for the day and down the far end of the hangar was an area hidden from prying Cadet eyes with canvas screens.
TSR2 being put together 'in secret'