nfn, when I visited the RAF Museum Reserve collection I was told that the RAF Museum insisted on restoration to original flight condition although obviously not to modern standards.
It is a few years since I was in the Newark Vulcan. From what I can remember many of the Calcs in the nose wheel bay might have been missing and the 90-way/ER panel was missing from the cockpit but the NBS was there with the cockpit looking complete; that is the point, as much original equipment as possible.